CN107085281A - optical imaging system - Google Patents

Abstract

The invention discloses an optical imaging system, which includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens in order from the object side to the image side. At least one lens among the first lens to the fifth lens has positive refractive power. The sixth lens may have negative refractive power, and both of its surfaces are aspherical, wherein at least one surface of the sixth lens has an inflection point. The lenses with refractive power in the optical imaging system are the first lens to the sixth lens. When certain conditions are met, it can have greater light collection and better light path adjustment capabilities to improve imaging quality.

Description

optical imaging system

technical field

The invention relates to an optical imaging system, and in particular to a miniaturized optical imaging system applied to electronic products.

Background technique

In recent years, with the rise of portable electronic products with photography functions, the demand for optical systems has increased day by day. The photosensitive components of general optical systems are nothing more than two types of photosensitive coupling devices (Charge Coupled Device; CCD) or complementary metal oxide semiconductor sensors (Complementary Metal-Oxide Semiconductor Sensor; CMOSSensor). The pixel size of components is shrinking, and the optical system is gradually developing into the high-pixel field, so the requirements for image quality are also increasing.

The traditional optical system mounted on portable devices mostly adopts four-element or five-element lens structure. However, due to the continuous improvement of the pixels of portable devices and the demand of end consumers for large apertures such as low-light and night shooting functions, the existing The advanced optical imaging system can no longer meet the higher-level photography requirements.

Therefore, how to effectively increase the amount of light entering the optical imaging system and further improve the quality of imaging has become a very important issue.

Contents of the invention

An embodiment of the present invention provides an optical imaging system that can utilize the refractive power of six lenses and the combination of convex and concave surfaces (convex or concave in the present invention basically refers to the distance between the object side or image side of each lens at different heights from the optical axis) The description of the geometric shape change), and then effectively increase the amount of light entering the optical imaging system, and improve the imaging quality at the same time, so as to be applied to small electronic products.

The terms and codes of lens parameters related to the embodiments of the present invention are listed as follows, as a reference for subsequent descriptions:

Lens parameters related to length or height

The maximum imaging height of the optical imaging system is represented by HOI; the height of the optical imaging system is represented by HOS; the distance between the first lens object side of the optical imaging system and the sixth lens image side is represented by InTL; the fixed diaphragm of the optical imaging system ( Aperture) to the distance between the imaging surface is represented by InS; the distance between the first lens and the second lens of the optical imaging system is represented by IN12 (example); the thickness of the first lens of the optical imaging system on the optical axis is represented by TP1 ( example).

Material-Dependent Lens Parameters

The dispersion coefficient of the first lens of the optical imaging system is represented by NA1 (example); the refractive index of the first lens is represented by Nd1 (example).

Lens parameters related to viewing angle

The angle of view is represented by AF; half of the angle of view is represented by HAF; the chief ray angle is represented by MRA.

Lens parameters related to entrance and exit pupils

The diameter of the entrance pupil of the optical imaging system is represented by HEP; the maximum effective radius of any surface of a single lens refers to the intersection point (Effective Half Diameter; EHD) of the incident light at the maximum angle of view of the system passing through the edge of the entrance pupil on the surface of the lens. , the vertical height between the intersection point and the optical axis. For example, the maximum effective radius on the object side of the first lens is represented by EHD11, and the maximum effective radius on the image side of the first lens is represented by EHD12. The maximum effective radius on the object side of the second lens is represented by EHD21, and the maximum effective radius on the image side of the second lens is represented by EHD22. The representation of the maximum effective radius of any surface of the remaining lenses in the optical imaging system can be deduced by analogy.

Parameters related to lens surface arc length and surface profile

The contour curve length of the maximum effective radius of any surface of a single lens refers to the intersection point of the surface of the lens and the optical axis of the optical imaging system as the starting point, from the starting point along the surface contour of the lens until Up to the end point of the maximum effective radius, the arc length of the curve between the aforementioned two points is the length of the contour curve of the maximum effective radius, expressed in ARS. For example, the length of the contour curve of the maximum effective radius on the object side of the first lens is represented by ARS11 , and the length of the contour curve of the maximum effective radius on the image side of the first lens is represented by ARS12 . The length of the contour curve of the maximum effective radius on the object side of the second lens is represented by ARS21, and the length of the contour curve of the maximum effective radius on the image side of the second lens is represented by ARS22. The representation of the length of the contour curve of the maximum effective radius of any surface of the remaining lenses in the optical imaging system can be deduced by analogy.

The contour curve length of 1/2 entrance pupil diameter (HEP) of any surface of a single lens refers to the intersection point of the surface of the lens and the optical axis of the optical imaging system belonging to it as the starting point, along the The surface profile of the lens is until the coordinate point on the surface is 1/2 the vertical height of the entrance pupil diameter from the optical axis, and the arc length of the curve between the aforementioned two points is the profile of 1/2 the entrance pupil diameter (HEP) Curve length, expressed in ARE. For example, the contour curve length of 1/2 entrance pupil diameter (HEP) on the object side of the first lens is represented by ARE11, and the contour curve length of 1/2 entrance pupil diameter (HEP) on the image side of the first lens is represented by ARE12. The contour curve length of 1/2 entrance pupil diameter (HEP) on the object side of the second lens is represented by ARE21, and the contour curve length of 1/2 entrance pupil diameter (HEP) on the image side of the second lens is represented by ARE22. The representation of the length of the contour curve of the 1/2 entrance pupil diameter (HEP) of any surface of the other lenses in the optical imaging system can be deduced by analogy.

Parameters related to lens surface depth

From the intersection point of the object side of the sixth lens on the optical axis to the end point of the maximum effective radius of the object side of the sixth lens, the distance between the above two points horizontal to the optical axis is represented by InRS61 (maximum effective radius depth); the image side of the sixth lens From the intersection point on the optical axis to the end point of the maximum effective radius on the image side of the sixth lens, the distance horizontal to the optical axis between the above two points is represented by InRS62 (maximum effective radius depth). For the expression of the depth (sinking amount) of the maximum effective radius of the object side or image side of other lenses, compare with the above.

Parameters Related to Lens Surface Type

The critical point C refers to a point on the surface of a specific lens that is tangent to a tangent plane perpendicular to the optical axis, except for the intersection point with the optical axis. For example, the vertical distance between the critical point C51 on the object side of the fifth lens and the optical axis is HVT51 (example), the vertical distance between the critical point C52 on the image side of the fifth lens and the optical axis is HVT52 (example), and the sixth lens object The vertical distance between the critical point C61 on the side surface and the optical axis is HVT61 (example), and the vertical distance between the critical point C62 on the image side of the sixth lens and the optical axis is HVT62 (example). The expression of the critical point on the object side or image side of other lenses and the vertical distance from the optical axis is compared with the above.

The inflection point closest to the optical axis on the object side of the sixth lens is IF611, the point sinking amount SGI611 (example), SGI611 is the intersection point of the object side of the sixth lens on the optical axis to the nearest optical axis of the object side of the sixth lens The horizontal displacement distance between the inflection points and the optical axis is parallel to the optical axis, and the vertical distance between the points of IF611 and the optical axis is HIF611 (example). The inflection point closest to the optical axis on the image side of the sixth lens is IF621, the point sinking amount SGI621 (example), SGI611 is the intersection point on the optical axis of the image side of the sixth lens to the nearest optical axis of the image side of the sixth lens The horizontal displacement distance between the inflection points parallel to the optical axis, and the vertical distance between the points of IF621 and the optical axis is HIF621 (example).

The second inflection point close to the optical axis on the object side of the sixth lens is IF612. The horizontal displacement distance parallel to the optical axis between inflection points close to the optical axis, and the vertical distance between the point in IF612 and the optical axis is HIF612 (example). The second inflection point on the image side of the sixth lens that is close to the optical axis is IF622, and the point sag is SGI622 (example). The horizontal displacement distance parallel to the optical axis between inflection points close to the optical axis, and the vertical distance between the points in IF622 and the optical axis is HIF622 (example).

The third inflection point close to the optical axis on the object side of the sixth lens is IF613. The horizontal displacement distance parallel to the optical axis between inflection points close to the optical axis, and the vertical distance between the points in IF613 and the optical axis is HIF613 (example). The third inflection point close to the optical axis on the sixth lens image side is IF623, and the point sinking amount SGI623 (example), SGI623 is the intersection point of the sixth lens image side on the optical axis to the sixth lens image side third The horizontal displacement distance parallel to the optical axis between inflection points close to the optical axis, and the vertical distance between the points in IF623 and the optical axis is HIF623 (example).

The fourth inflection point close to the optical axis on the object side of the sixth lens is IF614. The horizontal displacement distance parallel to the optical axis between inflection points close to the optical axis, and the vertical distance between the point in IF614 and the optical axis is HIF614 (example). The fourth inflection point close to the optical axis on the sixth lens image side is IF624, and the point sinking amount SGI624 (example), SGI624 is the intersection point of the sixth lens image side on the optical axis to the sixth lens image side fourth The horizontal displacement distance parallel to the optical axis between inflection points close to the optical axis, and the vertical distance between the points in IF624 and the optical axis is HIF624 (example).

The expression of the inflection point on the object side or image side of other lenses and its vertical distance from the optical axis or its sinking amount is compared with the above.

Variables related to aberrations

The optical distortion (Optical Distortion) of the optical imaging system is represented by ODT; its TV distortion (TVDistortion) is represented by TDT, and can be further defined to describe the degree of aberration shift between 50% and 100% of the imaging field; spherical aberration shift The amount is expressed in DFS; the coma aberration offset is expressed in DFC.

The lateral aberration at the edge of the aperture is represented by STA (STOP Transverse Aberration). To evaluate the performance of a specific optical imaging system, you can use the tangential fan or sagittal fan to calculate the lateral light of any field of view. Aberrations, especially the lateral aberrations of the longest working wavelength (for example, 650NM) and the shortest working wavelength (for example, 470NM) passing through the edge of the aperture are respectively calculated as the standard of excellent performance. The aforementioned coordinate directions of the meridian plane light fan can be further divided into positive direction (upward ray) and negative direction (downward ray). The lateral aberration of the longest working wavelength passing through the edge of the aperture, which is defined as the imaging position of the longest working wavelength incident on the imaging surface of a specific field of view through the edge of the aperture, which is on the imaging surface with the reference wavelength chief ray (for example, the wavelength is 555NM) The distance difference between the two positions of the imaging position of the field of view, the lateral aberration of the shortest working wavelength passing through the edge of the aperture, which is defined as the imaging position at which the shortest working wavelength is incident on the imaging surface on the imaging surface through the edge of the aperture, and its difference with the reference wavelength The distance difference between the two positions of the imaging position of the field of view on the imaging surface of the chief ray, evaluates the performance of a specific optical imaging system as excellent, and can use the shortest and longest working wavelengths to enter the 0.7 field of view on the imaging surface through the edge of the aperture ( That is, the lateral aberration of 0.7 imaging height HOI) is less than 100 microns (μm) as the inspection method, and even the shortest and longest working wavelengths can be incident on the imaging plane through the edge of the aperture, and the lateral aberration of 0.7 field of view is less than 80 microns (μm) as the inspection method.

The optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the imaging plane, and the longest working wavelength of visible light of the positive meridian plane light fan of the optical imaging system passes through the edge of the entrance pupil and is incident on the imaging plane by 0.7 The lateral aberration at HOI is represented by PLTA, and the shortest working wavelength of visible light of the light fan on the positive meridian plane passes through the edge of the entrance pupil and is incident on the imaging surface at 0.7 HOI. The lateral aberration at 0.7HOI is represented by PSTA. The longest operating wavelength of visible light of the negative meridian plane light fan of the system passes through the edge of the entrance pupil and is incident on the imaging surface at 0.7HOI. The lateral aberration is represented by NLTA. The negative meridian plane light fan of the optical imaging system The shortest working wavelength of visible light passes through the edge of the entrance pupil and is incident on the imaging surface at 0.7HOI. The lateral aberration at the edge of the pupil and incident on the imaging surface at 0.7 HOI is represented by SLTA, and the shortest operating wavelength of visible light of the sagittal plane light fan of the optical imaging system passes through the edge of the entrance pupil and is incident on the imaging surface at 0.7 The lateral aberration at the HOI is expressed in SSTA.

The invention provides an optical imaging system, in which an inflection point is set on the object side or the image side of the sixth lens, which can effectively adjust the incident angle of each field of view on the sixth lens, and correct optical distortion and TV distortion. In addition, the surface of the sixth lens can have a better optical path adjustment capability to improve imaging quality.

The invention provides an optical imaging system, which sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and an imaging surface from the object side to the image side. All the first lens to the sixth lens have refractive power. Wherein the optical imaging system has six lenses with refractive power, the optical imaging system has a maximum imaging height HOI on the imaging surface perpendicular to the optical axis, and the first lens to the sixth lens At least one of the surfaces of the at least two lenses has at least one inflection point, at least one of the first lens to the sixth lens has a positive refractive power, and the first lens to the sixth lens have a positive refractive power. The focal lengths are respectively f1, f2, f3, f4, f5, f6, the focal length of the optical imaging system is f, the entrance pupil diameter of the optical imaging system is HEP, and the first lens object side to the imaging surface There is a distance HOS on the optical axis, the object side of the first lens to the image side of the sixth lens has a distance InTL on the optical axis, half of the maximum viewing angle of the optical imaging system is HAF, and the The optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the imaging surface, starting from the intersection point of any surface of any lens in the above lens and the optical axis, along the contour of the surface until the surface Up to the coordinate point at the vertical height of 1/2 entrance pupil diameter from the optical axis, the length of the contour curve between the aforementioned two points is ARE, which satisfies the following conditions: 1.0≦f/HEP≦2.2; 0.5≦HOS/f≦ 5.0; 0.5≦HOS/HOI≦1.6 and 0.9≦2(ARE/HEP)≦1.5.

Preferably, the optical imaging system satisfies the following relationship: 0.5≦HOS/HOI≦1.5.

Preferably, half of the maximum viewing angle of the optical imaging system is HAF, which satisfies the following formula: 0deg<HAF≦60deg.

Preferably, the imaging surface is a plane or a curved surface.

Preferably, the TV distortion of the optical imaging system during imaging is TDT, the optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the imaging plane, and the positive meridional plane light of the optical imaging system The longest operating wavelength of the fan passes through the edge of the entrance pupil and is incident on the imaging surface at 0.7HOI. The lateral aberration at 0.7HOI on the imaging plane is represented by PSTA, and the longest operating wavelength of the negative meridian plane light fan of the optical imaging system passes through the edge of the entrance pupil and is incident on the transverse direction at 0.7HOI on the imaging plane. The aberration is represented by NLTA, the shortest operating wavelength of the negative meridian plane light fan of the optical imaging system passes through the edge of the entrance pupil and is incident on the imaging surface at 0.7HOI, and the lateral aberration is represented by NSTA, the optical imaging system The longest operating wavelength of the sagittal plane light fan of the system passes through the edge of the entrance pupil and the lateral aberration incident on the imaging surface at 0.7HOI is represented by SLTA, and the shortest working wavelength of the sagittal plane light fan of the optical imaging system passes through The lateral aberration at the edge of the entrance pupil and incident at 0.7 HOI on the imaging plane is represented by SSTA, which satisfies the following conditions: PLTA≦50 microns; PSTA≦50 microns; NLTA≦50 microns; NSTA≦50 microns; SLTA≦ 50 microns; SSTA≦50 microns; and |TDT|<100%.

Preferably, the maximum effective radius of any surface of any of the above-mentioned lenses is expressed in EHD, starting from the intersection of any surface of any of the above-mentioned lenses with the optical axis, along the contour of the surface until the The maximum effective radius of the surface is the end point, and the length of the contour curve between the aforementioned two points is ARS, which satisfies the following formula: 0.9≦ARS/EHD≦2.0.

Preferably, starting from the intersection point of the object side of the sixth lens on the optical axis, along the contour of the surface until the coordinate point on the surface at a vertical height of 1/2 the diameter of the entrance pupil from the optical axis So far, the length of the contour curve between the aforementioned two points is ARE61, starting from the intersection point of the image side of the sixth lens on the optical axis, along the contour of the surface until the incidence on the surface is 1/2 away from the optical axis Up to the coordinate point at the vertical height of the pupil diameter, the length of the contour curve between the aforementioned two points is ARE62, and the thickness of the sixth lens on the optical axis is TP6, which satisfies the following conditions: 0.05≦ARE61/TP6≦15; And 0.05≦ARE62/TP6≦15.

Preferably, starting from the intersection point of the object side of the fifth lens on the optical axis, along the contour of the surface until the coordinate point on the surface at a vertical height of 1/2 the diameter of the entrance pupil from the optical axis So far, the length of the contour curve between the aforementioned two points is ARE51, starting from the intersection point of the image side of the fifth lens on the optical axis, along the contour of the surface until the incident distance from the optical axis on the surface is 1/2 Up to the coordinate point at the vertical height of the pupil diameter, the length of the contour curve between the aforementioned two points is ARE52, and the thickness of the fifth lens on the optical axis is TP5, which satisfies the following conditions: 0.05≦ARE51/TP5≦15; And 0.05≦ARE52/TP5≦15.

Preferably, an aperture is further included, and there is a distance InS from the aperture to the imaging surface on the optical axis, which satisfies the following formula: 0.2≦InS/HOS≦1.1.

The present invention further provides an optical imaging system, which sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and an imaging surface from the object side to the image side. All the first lens to the sixth lens have refractive power. Wherein the optical imaging system has six lenses with refractive power, the optical imaging system has a maximum imaging height HOI on the imaging surface perpendicular to the optical axis, and the first lens to the sixth lens At least one surface of at least one lens has at least two inflection points, at least one of the first lens to the third lens has positive refractive power, and at least one of the fourth lens to the sixth lens Each lens has positive refractive power, the focal lengths of the first lens to the sixth lens are f1, f2, f3, f4, f5, f6 respectively, the focal length of the optical imaging system is f, and the optical imaging system The diameter of the entrance pupil is HEP, there is a distance HOS from the object side of the first lens to the imaging surface on the optical axis, and there is a distance from the object side of the first lens to the image side of the sixth lens on the optical axis InTL, half of the maximum viewing angle of the optical imaging system is HAF, and the optical imaging system has a maximum imaging height HOI on the imaging plane perpendicular to the optical axis, with any surface of any lens in the above-mentioned lens The intersection point with the optical axis is the starting point, along the contour of the surface until the coordinate point on the surface at a vertical height of 1/2 the diameter of the entrance pupil from the optical axis, the length of the contour curve between the aforementioned two points is ARE, It satisfies the following conditions: 1.0≦f/HEP≦2.2; 0.5≦HOS/f≦3.0; 0.5≦HOS/HOI≦1.6 and 0.9≦2(ARE/HEP)≦1.5.

Preferably, the optical imaging system satisfies the following relationship: 0.5≦HOS/HOI≦1.5.

Preferably, at least one surface of at least one lens among the first lens to the third lens has at least one critical point.

Preferably, the maximum effective radius of any surface of any of the above-mentioned lenses is expressed in EHD, starting from the intersection of any surface of any of the above-mentioned lenses with the optical axis, along the contour of the surface until the The maximum effective radius of the surface is the end point, and the length of the contour curve between the aforementioned two points is ARS, which satisfies the following formula: 0.9≦ARS/EHD≦2.0.

Preferably, the optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the imaging plane, and the longest working wavelength of the light fan on the positive meridian plane of the optical imaging system passes through the edge of the entrance pupil and is incident on the The lateral aberration at 0.7 HOI on the imaging plane is represented by PLTA, and the lateral aberration at 0.7 HOI on the imaging plane where the shortest operating wavelength of the fan on the positive meridian plane passes through the edge of the entrance pupil and is incident on the imaging plane at 0.7 HOI is represented by PSTA , the longest operating wavelength of the negative meridian plane light fan of the optical imaging system passes through the edge of the entrance pupil and is incident on the imaging surface at 0.7HOI. The lateral aberration is represented by NLTA. The shortest operating wavelength of the meridional light fan passes through the edge of the entrance pupil and the lateral aberration at 0.7HOI on the imaging surface is expressed in NSTA, and the longest operating wavelength of the sagittal light fan of the optical imaging system passes through the incident light The lateral aberration at the edge of the pupil and incident on the imaging surface at 0.7HOI is represented by SLTA, and the shortest operating wavelength of the sagittal plane light fan of the optical imaging system passes through the edge of the entrance pupil and is incident on the imaging surface at 0.7HOI The lateral aberration at is represented by SSTA, which satisfies the following conditions: PLTA≦50 μm; PSTA≦50 μm; NLTA≦50 μm; NSTA≦50 μm; SLTA≦50 μm; and SSTA≦50 μm.

Preferably, the distance on the optical axis between the first lens and the second lens is IN12, and satisfies the following formula: 0<IN12/f≦5.0.

Preferably, the distance on the optical axis between the fifth lens and the sixth lens is IN56, and satisfies the following formula: 0<IN56/f≦5.0.

Preferably, the distance between the fifth lens and the sixth lens on the optical axis is IN56, and the thicknesses of the fifth lens and the sixth lens on the optical axis are TP5 and TP6 respectively, which satisfy The following conditions: 0.1≦(TP6+IN56)/TP5≦50.

Preferably, the distance between the first lens and the second lens on the optical axis is IN12, and the thicknesses of the first lens and the second lens on the optical axis are TP1 and TP2 respectively, which satisfy The following conditions: 0.1≦(TP1+IN12)/TP2≦50.

Preferably, at least one of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens is a light filter with a wavelength of less than 500 nm Remove components.

The present invention further provides an optical imaging system, comprising sequentially from the object side to the image side: sequentially comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens from the object side to the image side and imaging surface. All the first lens to the sixth lens have refractive power. Wherein the optical imaging system has six lenses with refractive power, the optical imaging system has a maximum imaging height HOI on the imaging surface perpendicular to the optical axis, and at least one of the first lens to the third lens is One lens has positive refractive power, at least one lens among the fourth lens to the sixth lens has positive refractive power, and at least three lenses among the first lens to the sixth lens have at least A surface has at least one inflection point, the focal lengths of the first lens to the sixth lens are f1, f2, f3, f4, f5, f6 respectively, the focal length of the optical imaging system is f, and the optical imaging system The entrance pupil diameter of the system is HEP, the first lens object side to the imaging surface has a distance HOS on the optical axis, and the first lens object side to the sixth lens image side has a distance HOS on the optical axis A distance InTL, half of the maximum viewing angle of the optical imaging system is HAF, starting from the intersection point of any surface of any lens in the above-mentioned lens and the optical axis, along the contour of the surface until on the surface Up to the coordinate point at the vertical height of 1/2 entrance pupil diameter from the optical axis, the length of the contour curve between the aforementioned two points is ARE, which satisfies the following conditions: 1.0≦f/HEP≦2.2; 0.5≦HOS/f≦1.6 ; 0.5≦HOS/HOI≦1.6 and 0.9≦2(ARE/HEP)≦1.5.

Preferably, the maximum effective radius of any surface of any of the above-mentioned lenses is represented by EHD, starting from the intersection of any surface of any of the above-mentioned lenses with the optical axis, along the contour of the surface until the The maximum effective radius of the surface is the end point, and the length of the contour curve between the aforementioned two points is ARS, which satisfies the following formula: 0.9≦ARS/EHD≦2.0.

Preferably, the optical imaging system satisfies the following formula: 0mm<HOS≦30mm.

Preferably, starting from the intersection point of the object side of the sixth lens on the optical axis, along the contour of the surface until the coordinate point on the surface at a vertical height of 1/2 the diameter of the entrance pupil from the optical axis So far, the length of the contour curve between the aforementioned two points is ARE61, starting from the intersection point of the image side of the sixth lens on the optical axis, along the contour of the surface until the incidence on the surface is 1/2 away from the optical axis Up to the coordinate point at the vertical height of the pupil diameter, the length of the contour curve between the aforementioned two points is ARE62, and the thickness of the sixth lens on the optical axis is TP6, which satisfies the following conditions: 0.05≦ARE61/TP6≦15; And 0.05≦ARE62/TP6≦15.

Preferably, starting from the intersection point of the object side of the fifth lens on the optical axis, along the contour of the surface until the coordinate point on the surface at a vertical height of 1/2 the diameter of the entrance pupil from the optical axis So far, the length of the contour curve between the aforementioned two points is ARE51, starting from the intersection point of the image side of the fifth lens on the optical axis, along the contour of the surface until the surface is 1/2 away from the optical axis As far as the coordinate point at the vertical height of the entrance pupil diameter, the length of the contour curve between the aforementioned two points is ARE52, and the thickness of the fifth lens on the optical axis is TP5, which satisfies the following conditions: 0.05≦ARE51/TP5≦15 ; and 0.05≦ARE52/TP5≦15.

Preferably, the optical imaging system further includes an aperture, an image sensor and a drive module, the image sensor is arranged on the imaging surface, and there is a distance InS from the aperture to the imaging surface on the optical axis, The driving module is coupled with each of the lenses and causes each of the lenses to be displaced, which satisfies the following formula: 0.2≦InS/HOS≦1.1

The length of the contour curve of any surface of a single lens within the maximum effective radius affects the ability of the surface to correct aberrations and the optical path difference between rays of light in each field of view. The longer the length of the contour curve, the better the ability to correct aberrations, but at the same time It will also increase the difficulty of production, so it is necessary to control the length of the contour curve of any surface of a single lens within the maximum effective radius range, especially control the length of the contour curve (ARS) and the length of the contour curve within the maximum effective radius range of the surface. A proportional relationship (ARS/TP) between the thicknesses (TP) of the lenses on the optical axis to which the surfaces belong. For example, the length of the contour curve of the maximum effective radius on the object side of the first lens is represented by ARS11, the thickness of the first lens on the optical axis is TP1, the ratio between the two is ARS11/TP1, and the maximum effective radius of the first lens on the image side is The length of the profile curve is expressed in ARS12, and the ratio between it and TP1 is ARS12/TP1. The length of the profile curve of the maximum effective radius on the object side of the second lens is represented by ARS21, the thickness of the second lens on the optical axis is TP2, and the ratio between the two is ARS21/TP2, and the profile of the maximum effective radius on the image side of the second lens The length of the curve is expressed in ARS22, and the ratio between it and TP2 is ARS22/TP2. The proportional relationship between the length of the contour curve of the maximum effective radius of any surface of the other lenses in the optical imaging system and the thickness (TP) of the lens on the optical axis to which the surface belongs, and so on.

The length of the profile curve of any surface of a single lens within the height of 1/2 the entrance pupil diameter (HEP) specifically affects the corrected aberrations on said surface in the shared region of the field of view of each ray and the optical path difference between the rays of each field of view The longer the length of the profile curve, the better the ability to correct aberrations, but at the same time it will increase the difficulty of manufacturing. Therefore, it is necessary to control any surface of a single lens within the height range of 1/2 the entrance pupil diameter (HEP) The length of the contour curve within, especially controlling the length of the contour curve (ARE) within the height range of 1/2 the entrance pupil diameter (HEP) of the surface and the thickness (TP) of the lens on the optical axis to which the surface belongs ) proportional relationship (ARE/TP). For example, the length of the contour curve of the 1/2 entrance pupil diameter (HEP) height on the object side of the first lens is represented by ARE11, the thickness of the first lens on the optical axis is TP1, and the ratio between the two is ARE11/TP1, the first The length of the profile curve of the 1/2 entrance pupil diameter (HEP) height of the lens image side is represented by ARE12, and the ratio between it and TP1 is ARE12/TP1. The length of the contour curve of the 1/2 entrance pupil diameter (HEP) height on the object side of the second lens is represented by ARE21, the thickness of the second lens on the optical axis is TP2, and the ratio between the two is ARE21/TP2, the second lens The length of the profile curve at the height of 1/2 the entrance pupil diameter (HEP) of the mirror side is expressed by ARE22, and the ratio between it and TP2 is ARE22/TP2. The proportional relationship between the length of the profile curve of the 1/2 entrance pupil diameter (HEP) height of any surface of the other lenses in the optical imaging system and the thickness (TP) of the lens on the optical axis to which the surface belongs, which The way of expression is deduced by analogy.

When |f1|>|f6|, the total system height (HOS; Height of Optic System) of the optical imaging system can be appropriately shortened to achieve the purpose of miniaturization.

When |f2|+|f3|+|f4|+|f5| and |f1|+|f6| satisfy the above conditions, at least one of the second to fifth lenses has weak positive refractive power or weak negative inflection. The so-called weak refractive power means that the absolute value of the focal length of a specific lens is greater than 10. When at least one of the second to fifth lenses of the present invention has weak positive refractive power, it can effectively share the positive refractive power of the first lens to avoid unnecessary aberrations from appearing prematurely. On the contrary, if the second to fifth lenses At least one of the five lenses has a weak negative refractive power, so the aberration of the system can be fine-tuned and corrected.

In addition, the sixth lens can have negative refractive power, and its image side can be concave. Thereby, it is beneficial to shorten the back focal length to maintain miniaturization. In addition, at least one surface of the sixth lens may have at least one inflection point, which can effectively suppress the incident angle of the off-axis field of view light, and further correct the aberration of the off-axis field of view.

Description of drawings

The above and other features of the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1A shows the schematic diagram of the optical imaging system of the first embodiment of the present invention;

Fig. 1B shows the graphs of spherical aberration, astigmatism and optical distortion of the optical imaging system of the first embodiment of the present invention in order from left to right;

Fig. 1C shows the meridian plane light fan and the sagittal plane light fan of the optical imaging system of the first embodiment of the present invention, the lateral aberration diagram of the longest working wavelength and the shortest working wavelength passing through the edge of the aperture at 0.7 field of view ;

Fig. 2A shows the schematic diagram of the optical imaging system of the second embodiment of the present invention;

Fig. 2B shows the graphs of spherical aberration, astigmatism and optical distortion of the optical imaging system of the second embodiment of the present invention in order from left to right;

2C shows the lateral aberration diagram of the meridian plane light fan and the sagittal plane light fan of the optical imaging system of the second embodiment of the present invention, the longest working wavelength and the shortest working wavelength passing through the edge of the aperture at 0.7 field of view;

Fig. 3A shows the schematic diagram of the optical imaging system of the third embodiment of the present invention;

Fig. 3B shows the graphs of spherical aberration, astigmatism and optical distortion of the optical imaging system of the third embodiment of the present invention in order from left to right;

Fig. 3C shows the lateral aberration diagram of the meridian plane light fan and the sagittal plane light fan of the optical imaging system of the third embodiment of the present invention, the longest working wavelength and the shortest working wavelength passing through the edge of the aperture at a field of view of 0.7;

FIG. 4A shows a schematic diagram of an optical imaging system according to a fourth embodiment of the present invention;

Fig. 4B shows the graphs of spherical aberration, astigmatism and optical distortion of the optical imaging system of the fourth embodiment of the present invention in order from left to right;

Fig. 4C shows the lateral aberration diagram of the meridian plane light fan and the sagittal plane light fan of the optical imaging system of the fourth embodiment of the present invention, the longest working wavelength and the shortest working wavelength passing through the edge of the aperture at the field of view of 0.7;

FIG. 5A shows a schematic diagram of an optical imaging system according to a fifth embodiment of the present invention;

Fig. 5B shows the graphs of spherical aberration, astigmatism and optical distortion of the optical imaging system of the fifth embodiment of the present invention in order from left to right;

5C shows the meridian plane light fan and sagittal plane light fan of the optical imaging system of the fifth embodiment of the present invention, the longest working wavelength and the shortest working wavelength through the edge of the aperture at the 0.7 field of view lateral aberration diagram;

Fig. 6A shows the schematic diagram of the optical imaging system of the sixth embodiment of the present invention;

Fig. 6B shows the graphs of spherical aberration, astigmatism and optical distortion of the optical imaging system of the sixth embodiment of the present invention in order from left to right;

6C shows the meridian plane light fan and sagittal plane light fan of the optical imaging system of the sixth embodiment of the present invention, the longest working wavelength and the shortest working wavelength through the edge of the aperture at the 0.7 field of view lateral aberration diagram;

Fig. 7A shows the schematic diagram of the optical imaging system of the seventh embodiment of the present invention;

Fig. 7B shows the graphs of spherical aberration, astigmatism and optical distortion of the optical imaging system of the seventh embodiment of the present invention in order from left to right;

Fig. 7C shows the meridian plane light fan and sagittal plane light fan of the optical imaging system of the seventh embodiment of the present invention, the longest working wavelength and the shortest working wavelength through the edge of the aperture at the 0.7 field of view lateral aberration diagram;

FIG. 8A shows a schematic diagram of an optical imaging system according to an eighth embodiment of the present invention;

Fig. 8B shows the graphs of spherical aberration, astigmatism and optical distortion of the optical imaging system of the eighth embodiment of the present invention in order from left to right;

Fig. 8C shows the lateral aberration diagram of the meridian plane light fan and the sagittal plane light fan of the optical imaging system of the eighth embodiment of the present invention, the longest working wavelength and the shortest working wavelength passing through the edge of the aperture at the field of view of 0.7;

FIG. 9A shows a schematic diagram of an optical imaging system according to a ninth embodiment of the present invention;

Fig. 9B shows the graphs of spherical aberration, astigmatism and optical distortion of the optical imaging system of the ninth embodiment of the present invention in order from left to right;

9C shows the lateral aberration diagram of the meridian plane light fan and the sagittal plane light fan of the optical imaging system according to the ninth embodiment of the present invention, the longest working wavelength and the shortest working wavelength passing through the edge of the aperture at the field of view of 0.7.

Explanation of reference signs

Optical imaging system: 10, 20, 30, 40, 50, 60, 70, 80, 90

Aperture: 100, 200, 300, 400, 500, 600, 700, 800, 900

First lens: 110, 210, 310, 410, 510, 610, 710, 810, 910

Object side: 112, 212, 312, 412, 512, 612, 712, 812, 912

Like side: 114, 214, 314, 414, 514, 614, 714, 814, 914

Second lens: 120, 220, 320, 420, 520, 620, 720, 820, 920

Object side: 122, 222, 322, 422, 522, 622, 722, 822, 922

Like side: 124, 224, 324, 424, 524, 624, 724, 824, 924

Third lens: 130, 230, 330, 430, 530, 630, 730, 830, 930

Object side: 132, 232, 332, 432, 532, 632, 732, 832, 932

Like side: 134, 234, 334, 434, 534, 634, 734, 834, 934

Fourth lens: 140, 240, 340, 440, 540, 640, 740, 840, 940

Object side: 142, 242, 342, 442, 542, 642, 742, 842, 942

Like side: 144, 244, 344, 444, 544, 644, 744, 844, 944

Fifth lens: 150, 250, 350, 450, 550, 650, 750, 850, 950

Object side: 152, 252, 352, 452, 552, 652, 752, 852, 952

Like side: 154, 254, 354, 454, 554, 654, 754, 854, 954

Sixth lens: 160, 260, 360, 460, 560, 660, 760, 860, 960

Object side: 162, 262, 362, 462, 562, 662, 762, 862, 962

Image side: 164, 264, 364, 464, 564, 664, 764, 864, 964

Infrared filter: 180, 280, 380, 480, 580, 680, 780, 880, 980

Imaging surface: 190, 290, 390, 490, 590, 690, 790, 890, 990

Image sensor: 192, 292, 392, 492, 592, 692, 792, 892, 992

Focal length of optical imaging system: f

The focal length of the first lens: f1; the focal length of the second lens: f2; the focal length of the third lens: f3;

The focal length of the fourth lens: f4; the focal length of the fifth lens: f5; the focal length of the sixth lens: f6;

Aperture value of optical imaging system: f/HEP; Fno; F#

Half of the maximum viewing angle of the optical imaging system: HAF

Dispersion coefficient of the first lens: NA1

Dispersion coefficients of the second lens to the sixth lens: NA2, NA3, NA4, NA5, NA6

Radius of curvature of the first lens object side and image side: R1, R2

Radius of curvature of the second lens object side and image side: R3, R4

Radius of curvature on the object side and image side of the third lens: R5, R6

Radius of curvature of the fourth lens object side and image side: R7, R8

Radius of curvature of the fifth lens object side and image side: R9, R10

Radius of curvature of the sixth lens object side and image side: R11, R12

The thickness of the first lens on the optical axis: TP1

The thickness of the second to sixth lenses on the optical axis: TP2, TP3, TP4, TP5, TP6

The sum of the thicknesses of all lenses with refractive power: ΣTP

Distance between the first lens and the second lens on the optical axis: IN12

Distance between the second lens and the third lens on the optical axis: IN23

Distance between the third lens and the fourth lens on the optical axis: IN34

Distance between the fourth lens and the fifth lens on the optical axis: IN45

The distance between the fifth lens and the sixth lens on the optical axis: IN56

Horizontal displacement distance on the optical axis from the intersection point of the object side of the sixth lens on the optical axis to the position of the maximum effective radius of the object side of the sixth lens on the optical axis: InRS61

The inflection point closest to the optical axis on the object side of the sixth lens: IF611; the sinking amount of the point: SGI611

The vertical distance between the inflection point closest to the optical axis on the object side of the sixth lens and the optical axis: HIF611

The inflection point closest to the optical axis on the image side of the sixth lens: IF621; the sinking amount of the point: SGI621

The vertical distance between the inflection point closest to the optical axis on the image side of the sixth lens and the optical axis: HIF621

The second inflection point close to the optical axis on the object side of the sixth lens: IF612; the sinking amount of the point: SGI612

Vertical distance between the second inflection point closest to the optical axis on the object side of the sixth lens and the optical axis: HIF612

The second inflection point close to the optical axis on the image side of the sixth lens: IF622; the sinking amount of the point: SGI622

Vertical distance between the second inflection point closest to the optical axis on the image side of the sixth lens and the optical axis: HIF622

Critical point on the object side of the sixth lens: C61

The critical point of the image side of the sixth lens: C62

The horizontal displacement distance between the critical point on the object side of the sixth lens and the optical axis: SGC61

The horizontal displacement distance between the critical point on the image side of the sixth lens and the optical axis: SGC62

The vertical distance between the critical point on the object side of the sixth lens and the optical axis: HVT61

The vertical distance between the critical point on the image side of the sixth lens and the optical axis: HVT62

Total system height (the distance from the first lens object side to the imaging surface on the optical axis): HOS

Diagonal length of image sensor: Dg

Distance from aperture to imaging surface: InS

Distance from the object side of the first lens to the image side of the sixth lens: InTL

Distance from the image side of the sixth lens to the imaging surface: InB

Half of the diagonal length of the effective sensing area of the image sensor (maximum image height): HOI

TV Distortion (TV Distortion) of optical imaging system during imaging: TDT

Optical distortion (Optical Distortion) of optical imaging system during imaging: ODT

detailed description

An optical imaging system group includes a first lens with refractive power, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and an imaging surface in order from the object side to the image side. The optical imaging system may further include an image sensor disposed on the imaging surface.

The optical imaging system can be designed using three working wavelengths, namely 486.1nm, 587.5nm, and 656.2nm, among which 587.5nm is the main reference wavelength for extracting technical features. The optical imaging system can also be designed using five working wavelengths, namely 470nm, 510nm, 555nm, 610nm, and 650nm, among which 555nm is the main reference wavelength for extracting technical features.

The ratio of the focal length f of the optical imaging system to the focal length fp of each lens with positive refractive power is PPR, the ratio of the focal length f of the optical imaging system to the focal length fn of each lens with negative refractive power is NPR, and all lenses with positive refractive power The sum of PPR of powerful lenses is ΣPPR, and the sum of NPR of all lenses with negative refractive power is ΣNPR, which helps to control the total refractive power and total length of the optical imaging system when the following conditions are met: 0.5≦ΣPPR/|ΣNPR|≦ 15. Preferably, the following condition can be satisfied: 1≦ΣPPR/|ΣNPR|≦3.0.

The optical imaging system may further include an image sensor disposed on the imaging surface. Half of the diagonal length of the effective sensing area of the image sensor (that is, the imaging height of the optical imaging system or the maximum image height) is HOI, and the distance from the object side of the first lens to the imaging surface on the optical axis is HOS, which satisfies the following Conditions: 0≦HOS/HOI≦10; and 0.5≦HOS/f≦5. Preferably, the following conditions can be satisfied: 0.5≦HOS/HOI≦1.6; and 0.5≦HOS/f≦1.6. In this way, the miniaturization of the optical imaging system can be maintained so that it can be mounted on thin and portable electronic products.

In addition, in the optical imaging system of the present invention, at least one aperture can be set as required to reduce stray light and improve image quality.

In the optical imaging system of the present invention, the aperture configuration can be a front aperture or a middle aperture, wherein the front aperture means that the aperture is set between the subject and the first lens, and the middle aperture means that the aperture is set between the first lens and the first lens. imaging surface. If the aperture is a front aperture, it can make the exit pupil of the optical imaging system and the imaging surface have a longer distance to accommodate more optical components, and can increase the efficiency of the image sensor to receive images; if it is a central aperture, it will help To expand the field of view of the system, the optical imaging system has the advantage of a wide-angle lens. The distance between the aforementioned aperture and the imaging surface is InS, which satisfies the following condition: 0.2≦InS/HOS≦1.1. Thereby, both the miniaturization of the optical imaging system and the wide-angle characteristic can be maintained.

In the optical imaging system of the present invention, the distance between the object side of the first lens and the image side of the sixth lens is InTL, and the sum of the thicknesses of all lenses with refractive power on the optical axis is ΣTP, which satisfies the following conditions: 0.1≦ΣTP/ InTL≦0.9. In this way, the imaging contrast of the system and the yield rate of lens manufacturing can be taken into account at the same time, and an appropriate back focus can be provided to accommodate other components.

The curvature radius of the object side of the first lens is R1, and the curvature radius of the image side of the first lens is R2, which satisfy the following conditions: 0.001≦|R1/R2|≦20. In this way, the first lens has an appropriate positive refractive power strength to avoid excessive increase in spherical aberration. Preferably, the following condition can be satisfied: 0.01≦|R1/R2|<10.

The radius of curvature of the object side of the sixth lens is R11, and the radius of curvature of the image side of the sixth lens is R12, which satisfy the following condition: -7<(R11-R12)/(R11+R12)<50. Thereby, it is beneficial to correct the astigmatism generated by the optical imaging system.

The distance between the first lens and the second lens on the optical axis is IN12, which satisfies the following condition: 0<IN12/f≦5. In this way, it is helpful to improve the chromatic aberration of the lens and improve its performance.

The distance between the fifth lens and the sixth lens on the optical axis is IN56, which satisfies the following condition: 0<IN56/f≦5. In this way, it is helpful to improve the chromatic aberration of the lens and improve its performance.

The thicknesses of the first lens and the second lens on the optical axis are respectively TP1 and TP2, which satisfy the following condition: 0.1≦(TP1+IN12)/TP2≦50. In this way, it helps to control the sensitivity of optical imaging system manufacturing and improve its performance.

The thicknesses of the fifth lens and the sixth lens on the optical axis are TP5 and TP6 respectively, and the distance between the above two lenses on the optical axis is IN56, which satisfies the following condition: 0.1≦(TP6+IN56)/TP5≦50. Thereby, it is helpful to control the sensitivity of manufacturing the optical imaging system and reduce the overall height of the system.

The thicknesses of the second lens, the third lens and the fourth lens on the optical axis are TP2, TP3 and TP4 respectively, the distance between the second lens and the third lens on the optical axis is IN23, the third lens and the fourth lens are at The distance on the optical axis is IN45, and the distance between the object side of the first lens and the image side of the sixth lens is InTL, which satisfies the following condition: 0.1≦TP4/(IN34+TP4+IN45)<1. In this way, it is helpful to slightly correct the aberration generated by the incident light traveling process layer by layer and reduce the overall height of the system.

In the optical imaging system of the present invention, the vertical distance between the critical point C61 on the object side of the sixth lens and the optical axis is HVT61, the vertical distance between the critical point C62 on the image side of the sixth lens and the optical axis is HVT62, and the object side of the sixth lens is at The horizontal displacement distance from the intersection point on the optical axis to the critical point C61 on the optical axis is SGC61, and the horizontal displacement distance from the intersection point on the optical axis to the critical point C62 of the sixth lens image side on the optical axis is SGC62, which can meet the following conditions : 0mm≦HVT61≦3mm; 0mm<HVT62≦6mm; 0≦HVT61/HVT62; 0mm≦|SGC61|≦0.5mm; 0mm<|SGC62|≦2mm; ≦0.9. Thereby, the aberration of the off-axis field of view can be effectively corrected.

The optical imaging system of the present invention satisfies the following conditions: 0.2≦HVT62/HOI≦0.9. Preferably, the following condition can be satisfied: 0.3≦HVT62/HOI≦0.8. Thereby, it is helpful for aberration correction of the peripheral field of view of the optical imaging system.

The optical imaging system of the present invention satisfies the following conditions: 0≦HVT62/HOS≦0.5. Preferably, the following condition can be satisfied: 0.2≦HVT62/HOS≦0.45. Thereby, it is helpful for aberration correction of the peripheral field of view of the optical imaging system.

In the optical imaging system of the present invention, the horizontal displacement distance parallel to the optical axis between the intersection point of the object side of the sixth lens on the optical axis and the inflection point of the nearest optical axis of the object side of the sixth lens is represented by SGI611, and the sixth lens image The horizontal displacement distance parallel to the optical axis between the intersection point of the side on the optical axis and the inflection point of the nearest optical axis on the side of the sixth lens image is expressed in SGI621, which meets the following conditions: 0<SGI611/(SGI611+TP6)≦0.9 ; 0<SGI621/(SGI621+TP6)≦0.9. Preferably, the following conditions can be satisfied: 0.1≦SGI611/(SGI611+TP6)≦0.6; 0.1≦SGI621/(SGI621+TP6)≦0.6.

The horizontal displacement distance parallel to the optical axis between the intersection point of the object side of the sixth lens on the optical axis and the second inflection point close to the optical axis of the object side of the sixth lens is represented by SGI612. The horizontal displacement distance parallel to the optical axis between the intersection point and the second inflection point close to the optical axis on the image side of the sixth lens is expressed in SGI622, which meets the following conditions: 0<SGI612/(SGI612+TP6)≦0.9; 0<SGI622 /(SGI622+TP6)≦0.9. Preferably, the following conditions can be satisfied: 0.1≦SGI612/(SGI612+TP6)≦0.6; 0.1≦SGI622/(SGI622+TP6)≦0.6.

The vertical distance between the inflection point of the nearest optical axis on the object side of the sixth lens and the optical axis is represented by HIF611, and the vertical distance between the inflection point of the nearest optical axis on the image side of the sixth lens and the optical axis is represented by HIF621, which meet the following conditions : 0.001mm≦|HIF611|≦5mm; 0.001mm≦|HIF621|≦5mm. Preferably, the following conditions can be met: 0.1mm≦|HIF611|≦3.5mm; 1.5mm≦|HIF621|≦3.5mm.

The vertical distance between the second inflection point close to the optical axis on the object side of the sixth lens and the optical axis is represented by HIF612, and the vertical distance between the second inflection point close to the optical axis on the image side of the sixth lens and the optical axis is represented by HIF622. It satisfies the following conditions: 0.001mm≦|HIF612|≦5mm; 0.001mm≦|HIF622|≦5mm. Preferably, the following conditions can be met: 0.1mm≦|HIF622|≦3.5mm; 0.1mm≦|HIF612|≦3.5mm.

The vertical distance between the third inflection point close to the optical axis on the object side of the sixth lens and the optical axis is represented by HIF613, and the vertical distance between the third inflection point close to the optical axis on the image side of the sixth lens and the optical axis is represented by HIF623. It satisfies the following conditions: 0.001mm≦|HIF613|≦5mm; 0.001mm≦|HIF623|≦5mm. Preferably, the following conditions can be met: 0.1mm≦|HIF623|≦3.5mm; 0.1mm≦|HIF613|≦3.5mm.

The vertical distance between the fourth inflection point close to the optical axis on the object side of the sixth lens and the optical axis is represented by HIF614, and the vertical distance between the fourth inflection point on the image side of the sixth lens and the optical axis is represented by HIF624. It satisfies the following conditions: 0.001mm≦|HIF614|≦5mm; 0.001mm≦|HIF624|≦5mm. Preferably, the following conditions can be met: 0.1mm≦|HIF624|≦3.5mm; 0.1mm≦|HIF614|≦3.5mm.

An embodiment of the optical imaging system of the present invention can facilitate the correction of chromatic aberration of the optical imaging system by arranging lenses with high dispersion coefficient and low dispersion coefficient alternately.

The equation for the above aspheric surface is:

z＝ch ² /[1+[1(k+1)c ² h ² ] ^0.5 ]+A4h ⁴ +A6h ⁶ +A8h ⁸ +A10h ¹⁰ +A12h ¹² +A14h ¹⁴ +A16h ¹⁶ +A18h ¹⁸ +A20h ²⁰ + …(1)

Among them, z is the position value at the position of height h along the optical axis, taking the surface vertex as a reference, k is the cone coefficient, c is the reciprocal of the radius of curvature, and A4, A6, A8, A10, A12, A14, A16 , A18 and A20 are high-order aspheric coefficients.

In the optical imaging system provided by the present invention, the material of the lens can be plastic or glass. When the lens is made of plastic, the production cost and weight can be effectively reduced. In addition, when the material of the lens is glass, the thermal effect can be controlled and the design space of the refractive power configuration of the optical imaging system can be increased. In addition, the object side and image side of the first lens to the sixth lens in the optical imaging system can be aspherical, which can obtain more control variables. In addition to reducing aberrations, compared with the use of traditional glass lenses, even The number of lenses used can be reduced, so the total height of the optical imaging system of the present invention can be effectively reduced.

Furthermore, in the optical imaging system provided by the present invention, if the lens surface is convex, it means that the lens surface is convex at the near optical axis in principle; if the lens surface is concave, it means that the lens surface is concave at the near optical axis in principle.

The optical imaging system of the present invention can also be applied to a mobile focus optical system according to requirements, and has the characteristics of excellent aberration correction and good imaging quality, thereby expanding the application level.

The optical imaging system of the present invention may also include a driving module as required, which can be coupled with the lenses and cause the lenses to be displaced. The aforementioned drive module may be a voice coil motor (VCM) for driving the lens to focus, or an optical image stabilization element (OIS) for reducing the frequency of out-of-focus caused by lens vibration during shooting.

The optical imaging system of the present invention can also make at least one of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens be a light filter component with a wavelength of less than 500nm according to requirements, which can The coating on at least one surface of the specific lens with filtering function or the lens itself is made of a material capable of filtering out short wavelengths.

The imaging surface of the optical imaging system of the present invention can also be selected as a plane or a curved surface according to requirements. When the imaging surface is a curved surface (such as a spherical surface with a radius of curvature), it helps to reduce the incident angle required for the focused light on the imaging surface. In addition to helping to achieve the length (TTL) of the miniaturized optical imaging system, it is also helpful for improving the relative Illumination also helps.

According to the above-mentioned implementation manners, specific embodiments are proposed below and described in detail with reference to the drawings.

first embodiment

Please refer to FIG. 1A and FIG. 1B, wherein FIG. 1A shows a schematic diagram of an optical imaging system according to the first embodiment of the present invention, and FIG. 1B shows spherical aberration, Curves of astigmatism and optical distortion. 1C is a lateral aberration diagram of the meridian plane light fan and the sagittal plane light fan of the optical imaging system of the first embodiment, the longest working wavelength and the shortest working wavelength passing through the edge of the aperture at a field of view of 0.7. It can be seen from FIG. 1A that the optical imaging system includes a first lens 110, an aperture 100, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, a sixth lens 160, and an infrared lens from the object side to the image side. A filter 180 , an imaging surface 190 and an image sensor 192 .

The first lens 110 has negative refractive power and is made of plastic material. The object side 112 is concave, and the image side 114 is concave, both of which are aspherical. The object side 112 has two inflection points. The length of the contour curve of the maximum effective radius on the object side of the first lens is represented by ARS11 , and the length of the contour curve of the maximum effective radius on the image side of the first lens is represented by ARS12 . The contour curve length of 1/2 entrance pupil diameter (HEP) on the object side of the first lens is represented by ARE11, and the contour curve length of 1/2 entrance pupil diameter (HEP) on the image side of the first lens is represented by ARE12. The thickness of the first lens on the optical axis is TP1.

The horizontal displacement distance parallel to the optical axis between the intersection point of the object side of the first lens on the optical axis and the inflection point of the closest optical axis of the object side of the first lens is represented by SGI111, and the intersection point of the image side of the first lens on the optical axis to The horizontal displacement distance parallel to the optical axis between the inflection points of the nearest optical axis on the side of the first lens image is represented by SGI121, which satisfies the following conditions: SGI111=-0.0031mm; |SGI111|/(|SGI111|+TP1)=0.0016 .

The horizontal displacement distance parallel to the optical axis between the intersection point of the object side of the first lens on the optical axis and the second inflection point close to the optical axis of the object side of the first lens is represented by SGI112, and the distance of the image side of the first lens on the optical axis The horizontal displacement distance parallel to the optical axis between the intersection point and the second inflection point close to the optical axis on the side of the first lens is represented by SGI122, which satisfies the following conditions: SGI112=1.3178mm; |SGI112|/(|SGI112|+TP1 ) = 0.4052.

The vertical distance between the inflection point of the nearest optical axis on the object side of the first lens and the optical axis is represented by HIF111, and the vertical distance between the inflection point of the nearest optical axis on the image side of the first lens and the optical axis is represented by HIF121, which satisfies the following conditions : HIF111 = 0.5557mm; HIF111/HOI = 0.1111.

The vertical distance between the second inflection point close to the optical axis on the object side of the first lens and the optical axis is represented by HIF112, and the vertical distance between the second inflection point close to the optical axis on the image side of the first lens and the optical axis is represented by HIF122. It satisfies the following conditions: HIF112=5.3732mm; HIF112/HOI=1.0746.

The second lens 120 has positive refractive power and is made of plastic material. The object side 122 is convex, and the image side 124 is convex, both of which are aspherical. The object side 122 has an inflection point. The length of the contour curve of the maximum effective radius on the object side of the second lens is represented by ARS21, and the length of the contour curve of the maximum effective radius on the image side of the second lens is represented by ARS22. The contour curve length of 1/2 entrance pupil diameter (HEP) on the object side of the second lens is represented by ARE21, and the contour curve length of 1/2 entrance pupil diameter (HEP) on the image side of the second lens is represented by ARE22. The thickness of the second lens on the optical axis is TP2.

The horizontal displacement distance parallel to the optical axis between the intersection point of the object side of the second lens on the optical axis and the inflection point of the nearest optical axis of the object side of the second lens is represented by SGI211, and the intersection point of the image side of the second lens on the optical axis to The horizontal displacement distance parallel to the optical axis between the inflection points of the nearest optical axis on the side of the second lens image is represented by SGI221, which satisfies the following conditions: SGI211=0.1069mm; |SGI211|/(|SGI211|+TP2)=0.0412; SGI221=0 mm; |SGI221|/(|SGI221|+TP2)=0.

The vertical distance between the inflection point of the nearest optical axis on the object side of the second lens and the optical axis is represented by HIF211, and the vertical distance between the inflection point of the nearest optical axis on the image side of the second lens and the optical axis is represented by HIF221, which meet the following conditions : HIF211=1.1264mm; HIF211/HOI=0.2253; HIF221=0mm; HIF221/HOI=0.

The third lens 130 has negative refractive power and is made of plastic material. The object side 132 is concave, and the image side 134 is convex, both of which are aspherical. Both the object side 132 and the image side 134 have an inflection point. The length of the contour curve of the maximum effective radius on the object side of the third lens is represented by ARS31, and the length of the contour curve of the maximum effective radius on the image side of the third lens is represented by ARS32. The contour curve length of 1/2 entrance pupil diameter (HEP) on the object side of the third lens is represented by ARE31, and the contour curve length of 1/2 entrance pupil diameter (HEP) on the image side of the third lens is represented by ARE32. The thickness of the third lens on the optical axis is TP3.

The horizontal displacement distance parallel to the optical axis between the intersection point of the object side of the third lens on the optical axis and the inflection point of the nearest optical axis of the object side of the third lens is represented by SGI311, and the intersection point of the image side of the third lens on the optical axis to The horizontal displacement distance parallel to the optical axis between the inflection points of the nearest optical axis on the third lens image side is represented by SGI321, which satisfies the following conditions: SGI311=-0.3041mm; |SGI311|/(|SGI311|+TP3)=0.4445 ;SGI321=-0.1172mm; |SGI321|/(|SGI321|+TP3)=0.2357.

The vertical distance between the inflection point of the nearest optical axis on the object side of the third lens and the optical axis is represented by HIF311, and the vertical distance between the inflection point of the nearest optical axis on the image side of the third lens and the optical axis is represented by HIF321, which meets the following conditions : HIF311=1.5907mm; HIF311/HOI=0.3181; HIF321=1.3380mm; HIF321/HOI=0.2676.

The fourth lens 140 has positive refractive power and is made of plastic material. Its object side 142 is convex, its image side 144 is concave, and both are aspherical. The object side 142 has two inflection points and the image side 144 has a Inflection point. The length of the contour curve of the maximum effective radius on the object side of the fourth lens is represented by ARS41, and the length of the contour curve of the maximum effective radius on the image side of the fourth lens is represented by ARS42. The profile curve length of 1/2 entrance pupil diameter (HEP) on the object side of the fourth lens is represented by ARE41, and the profile curve length of 1/2 entrance pupil diameter (HEP) on the image side of the fourth lens is represented by ARE42. The thickness of the fourth lens on the optical axis is TP4.

The horizontal displacement distance parallel to the optical axis between the intersection point of the object side of the fourth lens on the optical axis and the inflection point of the nearest optical axis of the object side of the fourth lens is expressed in SGI411, and the intersection point of the image side of the fourth lens on the optical axis to The horizontal displacement distance parallel to the optical axis between the inflection points of the nearest optical axis on the side of the fourth lens image is represented by SGI421, which satisfies the following conditions: SGI411=0.0070mm; |SGI411|/(|SGI411|+TP4)=0.0056; SGI421=0.0006 mm; |SGI421|/(|SGI421|+TP4)=0.0005.

The horizontal displacement distance parallel to the optical axis between the intersection point of the object side of the fourth lens on the optical axis and the second inflection point close to the optical axis of the object side of the fourth lens is represented by SGI412, and the distance of the image side of the fourth lens on the optical axis The horizontal displacement distance parallel to the optical axis between the intersection point and the second inflection point close to the optical axis on the fourth lens image side is represented by SGI422, which satisfies the following conditions: SGI412=-0.2078mm; |SGI412|/(|SGI412|+ TP4) = 0.1439.

The vertical distance between the inflection point of the nearest optical axis on the object side of the fourth lens and the optical axis is represented by HIF411, and the vertical distance between the inflection point of the nearest optical axis on the image side of the fourth lens and the optical axis is represented by HIF421, which meet the following conditions : HIF411=0.4706 mm; HIF411/HOI=0.0941; HIF421=0.1721 mm; HIF421/HOI=0.0344.

The vertical distance between the second inflection point close to the optical axis on the object side of the fourth lens and the optical axis is represented by HIF412, and the vertical distance between the second inflection point close to the optical axis on the image side of the fourth lens and the optical axis is represented by HIF422. It satisfies the following conditions: HIF412=2.0421 mm; HIF412/HOI=0.4084.

The fifth lens 150 has a positive refractive power and is made of plastic material. Its object side 152 is a convex surface, and its image side 154 is a convex surface, both of which are aspherical. The object side 152 has two inflection points and the image side 154 has a Inflection point. The length of the contour curve of the maximum effective radius on the object side of the fifth lens is represented by ARS51, and the length of the contour curve of the maximum effective radius on the image side of the fifth lens is represented by ARS52. The contour curve length of 1/2 entrance pupil diameter (HEP) on the object side of the fifth lens is represented by ARE51, and the contour curve length of 1/2 entrance pupil diameter (HEP) on the image side of the fifth lens is represented by ARE52. The thickness of the fifth lens on the optical axis is TP5.

The horizontal displacement distance parallel to the optical axis between the intersection point of the object side of the fifth lens on the optical axis and the inflection point of the nearest optical axis on the object side of the fifth lens is expressed in SGI511, and the intersection point of the image side of the fifth lens on the optical axis to The horizontal displacement distance parallel to the optical axis between the inflection points of the nearest optical axis on the fifth lens image side is represented by SGI521, which satisfies the following conditions: SGI511=0.00364mm; |SGI511|/(|SGI511|+TP5)=0.00338; SGI521=-0.63365 mm; |SGI521|/(|SGI521|+TP5)=0.37154.

The horizontal displacement distance parallel to the optical axis between the intersection point of the object side of the fifth lens on the optical axis and the second inflection point close to the optical axis of the object side of the fifth lens is represented by SGI512, and the distance of the image side of the fifth lens on the optical axis The horizontal displacement distance parallel to the optical axis between the point of intersection and the second inflection point close to the optical axis on the fifth lens image side is represented by SGI522, which satisfies the following conditions: SGI512=-0.32032mm; |SGI512|/(|SGI512|+ TP5) = 0.23009.

The horizontal displacement distance parallel to the optical axis between the intersection point of the object side of the fifth lens on the optical axis and the third inflection point close to the optical axis of the object side of the fifth lens is represented by SGI513, and the distance of the image side of the fifth lens on the optical axis The horizontal displacement distance parallel to the optical axis between the point of intersection and the third inflection point close to the optical axis on the fifth lens image side is represented by SGI523, which satisfies the following conditions: SGI513=0mm; |SGI513|/(|SGI513|+TP5) =0; SGI523=0 mm; |SGI523|/(|SGI523|+TP5)=0.

The horizontal displacement distance parallel to the optical axis between the intersection point of the object side of the fifth lens on the optical axis and the fourth inflection point of the object side of the fifth lens close to the optical axis is represented by SGI514, and the distance of the image side of the fifth lens on the optical axis The horizontal displacement distance parallel to the optical axis between the point of intersection and the fourth inflection point on the fifth lens image side close to the optical axis is represented by SGI524, which satisfies the following conditions: SGI514=0mm; |SGI514|/(|SGI514|+TP5) =0; SGI524=0 mm; |SGI524|/(|SGI524|+TP5)=0.

The vertical distance between the inflection point of the nearest optical axis on the object side of the fifth lens and the optical axis is represented by HIF511, and the vertical distance between the inflection point of the nearest optical axis on the image side of the fifth lens and the optical axis is represented by HIF521, which meet the following conditions : HIF511=0.28212mm; HIF511/HOI=0.05642; HIF521=2.13850mm; HIF521/HOI=0.42770.

The vertical distance between the second inflection point close to the optical axis on the object side of the fifth lens and the optical axis is represented by HIF512, and the vertical distance between the second inflection point close to the optical axis on the image side of the fifth lens and the optical axis is represented by HIF522. It satisfies the following conditions: HIF512=2.51384mm; HIF512/HOI=0.50277.

The vertical distance between the third inflection point close to the optical axis on the object side of the fifth lens and the optical axis is represented by HIF513, and the vertical distance between the third inflection point on the image side of the fifth lens and the optical axis is represented by HIF523. It satisfies the following conditions: HIF513=0mm; HIF513/HOI=0; HIF523=0mm; HIF523/HOI=0.

The vertical distance between the fourth inflection point close to the optical axis on the object side of the fifth lens and the optical axis is represented by HIF514, and the vertical distance between the fourth inflection point on the image side of the fifth lens and the optical axis is represented by HIF524. It satisfies the following conditions: HIF514=0mm; HIF514/HOI=0; HIF524=0mm; HIF524/HOI=0.

The sixth lens 160 has negative refractive power and is made of plastic material. The object side 162 is concave, and the image side 164 is concave. The object side 162 has two inflection points and the image side 164 has one inflection point. Thereby, the incident angle of each field of view on the sixth lens can be effectively adjusted to improve the aberration. The length of the contour curve of the maximum effective radius on the object side of the sixth lens is represented by ARS61, and the length of the contour curve of the maximum effective radius on the image side of the sixth lens is represented by ARS62. The profile curve length of 1/2 entrance pupil diameter (HEP) on the object side of the sixth lens is represented by ARE61, and the profile curve length of 1/2 entrance pupil diameter (HEP) on the image side of the sixth lens is represented by ARE62. The thickness of the sixth lens on the optical axis is TP6.

The horizontal displacement distance parallel to the optical axis between the intersection point of the object side of the sixth lens on the optical axis and the inflection point of the nearest optical axis on the object side of the sixth lens is expressed in SGI611, and the intersection point of the image side of the sixth lens on the optical axis to The horizontal displacement distance parallel to the optical axis between the inflection points of the nearest optical axis on the image side of the sixth lens is represented by SGI621, which satisfies the following conditions: SGI611=-0.38558mm; |SGI611|/(|SGI611|+TP6)=0.27212 ;SGI621=0.12386mm;|SGI621|/(|SGI621|+TP6)=0.10722.

The horizontal displacement distance parallel to the optical axis between the intersection point of the object side of the sixth lens on the optical axis and the second inflection point close to the optical axis of the object side of the sixth lens is represented by SGI612. The horizontal displacement distance parallel to the optical axis between the point of intersection and the second inflection point close to the optical axis on the side of the sixth lens is represented by SGI621, which satisfies the following conditions: SGI612=-0.47400mm; |SGI612|/(|SGI612|+ TP6)=0.31488; SGI622=0 mm; |SGI622|/(|SGI622|+TP6)=0.

The vertical distance between the inflection point of the nearest optical axis on the object side of the sixth lens and the optical axis is represented by HIF611, and the vertical distance between the inflection point of the nearest optical axis on the image side of the sixth lens and the optical axis is represented by HIF621, which meet the following conditions : HIF611=2.24283mm; HIF611/HOI=0.44857; HIF621=1.07376mm; HIF621/HOI=0.21475.

The vertical distance between the second inflection point close to the optical axis on the object side of the sixth lens and the optical axis is represented by HIF612, and the vertical distance between the second inflection point close to the optical axis on the image side of the sixth lens and the optical axis is represented by HIF622. It satisfies the following conditions: HIF612=2.48895mm; HIF612/HOI=0.49779.

The vertical distance between the third inflection point close to the optical axis on the object side of the sixth lens and the optical axis is represented by HIF613, and the vertical distance between the third inflection point close to the optical axis on the image side of the sixth lens and the optical axis is represented by HIF623. It satisfies the following conditions: HIF613=0mm; HIF613/HOI=0; HIF623=0mm; HIF623/HOI=0.

The vertical distance between the fourth inflection point close to the optical axis on the object side of the sixth lens and the optical axis is represented by HIF614, and the vertical distance between the fourth inflection point on the image side of the sixth lens and the optical axis is represented by HIF624. It satisfies the following conditions: HIF614=0mm; HIF614/HOI=0; HIF624=0mm; HIF624/HOI=0.

The infrared filter 180 is made of glass, which is disposed between the sixth lens 160 and the imaging surface 190 and does not affect the focal length of the optical imaging system.

In the optical imaging system of the present embodiment, the focal length of the optical imaging system is f, the entrance pupil diameter of the optical imaging system is HEP, half of the maximum viewing angle in the optical imaging system is HAF, and its numerical value is as follows: f=4.075mm; f/ HEP = 1.4; and HAF = 50.001 degrees and tan(HAF) = 1.1918.

In the optical imaging system of this embodiment, the focal length of the first lens 110 is f1, and the focal length of the sixth lens 160 is f6, which satisfy the following conditions: f1=-7.828mm; |f/f1|=0.52060; f6=-4.886 ; and |f1|>|f6|.

In the optical imaging system of this embodiment, the focal lengths of the second lens 120 to the fifth lens 150 are respectively f2, f3, f4, and f5, which satisfy the following conditions: |f2|+|f3|+|f4|+|f5| =95.50815 mm; |f1|+|f6|=12.71352 mm and |f2|+|f3|+|f4|+|f5|>|f1|+|f6|.

The ratio of the focal length f of the optical imaging system to the focal length fp of each lens with positive refractive power is PPR, and the ratio of the focal length f of the optical imaging system to the focal length fn of each lens with negative refractive power is NPR. In the optical imaging system, the sum of PPR of all lenses with positive refractive power is ΣPPR=f/f2+f/f4+f/f5=1.63290, and the sum of NPR of all lenses with negative refractive power is ΣNPR=|f/f1| +|f/f3|+|f/f6|=1.51305, ΣPPR/|ΣNPR|=1.07921. At the same time, the following conditions are satisfied: |f/f2|=0.69101; |f/f3|=0.15834; |f/f4|=0.06883; |f/f5|=0.87305; |f/f6|=0.83412.

In the optical imaging system of this embodiment, the distance between the first lens object side 112 and the sixth lens image side 164 is InTL, the distance between the first lens object side 112 and the imaging surface 190 is HOS, and the aperture 100 to the imaging surface 180 The distance between them is InS, half of the diagonal length of the effective sensing area of the image sensor 192 is HOI, and the distance between the sixth lens image side 164 and the imaging surface 190 is BFL, which satisfies the following conditions: InTL+BFL=HOS; HOS = 19.54120 mm; HOI = 5.0 mm; HOS/HOI = 3.90824; HOS/f = 4.7952; InS = 11.685 mm;

In the optical imaging system of this embodiment, the sum of the thicknesses of all lenses with refractive power on the optical axis is ΣTP, which satisfies the following conditions: ΣTP=8.13899 mm; and ΣTP/InTL=0.52477. In this way, the imaging contrast of the system and the yield rate of lens manufacturing can be taken into account at the same time, and an appropriate back focus can be provided to accommodate other components.

In the optical imaging system of this embodiment, the curvature radius of the first lens object side 112 is R1, and the curvature radius of the first lens image side 114 is R2, which satisfy the following condition: |R1/R2|=8.99987. In this way, the first lens can have an appropriate positive refractive power strength to avoid excessive increase in spherical aberration.

In the optical imaging system of the present embodiment, the radius of curvature of the sixth lens object side surface 162 is R11, and the curvature radius of the sixth lens image side surface 164 is R12, which satisfies the following conditions: (R11-R12)/(R11+R12)= 1.27780. Thereby, it is beneficial to correct the astigmatism generated by the optical imaging system.

In the optical imaging system of this embodiment, the sum of the focal lengths of all lenses with positive refractive power is ΣPP, which satisfies the following conditions: ΣPP=f2+f4+f5=69.770mm; and f5/(f2+f4+f5)=0.067 . Thereby, it is helpful to properly distribute the positive refractive power of the single lens to other positive lenses, so as to suppress the occurrence of significant aberrations during the process of incident light.

In the optical imaging system of this embodiment, the sum of the focal lengths of all lenses with negative refractive power is ΣNP, which satisfies the following conditions: ΣNP=f1+f3+f6=-38.451mm; and f6/(f1+f3+f6)= 0.127. Thereby, it is helpful to properly distribute the negative refractive power of the sixth lens to other negative lenses, so as to suppress the occurrence of significant aberrations during the incident light traveling process.

In the optical imaging system of this embodiment, the distance between the first lens 110 and the second lens 120 on the optical axis is IN12, which satisfies the following conditions: IN12=6.418mm; IN12/f=1.57491. In this way, it is helpful to improve the chromatic aberration of the lens and improve its performance.

In the optical imaging system of this embodiment, the distance between the fifth lens 150 and the sixth lens 160 on the optical axis is IN56, which satisfies the following conditions: IN56=0.025mm; IN56/f=0.00613. In this way, it is helpful to improve the chromatic aberration of the lens and improve its performance.

In the optical imaging system of this embodiment, the thicknesses of the first lens 110 and the second lens 120 on the optical axis are TP1 and TP2 respectively, which satisfy the following conditions: TP1=1.934mm; TP2=2.486mm; and (TP1+IN12 )/TP2=3.36005. In this way, it helps to control the sensitivity of optical imaging system manufacturing and improve its performance.

In the optical imaging system of the present embodiment, the thicknesses of the fifth lens 150 and the sixth lens 160 on the optical axis are TP5 and TP6 respectively, and the distance between the aforementioned two lenses on the optical axis is IN56, which satisfies the following conditions: TP5= 1.072mm; TP6=1.031mm; and (TP6+IN56)/TP5=0.98555. Thereby, it is helpful to control the sensitivity of manufacturing the optical imaging system and reduce the overall height of the system.

In the optical imaging system of this embodiment, the distance between the third lens 130 and the fourth lens 140 on the optical axis is IN34, and the distance between the fourth lens 140 and the fifth lens 150 on the optical axis is IN45, which satisfies the following Conditions: IN34=0.401 mm; IN45=0.025 mm; and TP4/(IN34+TP4+IN45)=0.74376. In this way, it is helpful to slightly correct the aberration generated by the incident light traveling process layer by layer and reduce the overall height of the system.

In the optical imaging system of the present embodiment, the horizontal displacement distance from the fifth lens object side surface 152 on the optical axis to the maximum effective radius position of the fifth lens object side surface 152 on the optical axis is InRS51, and the fifth lens image side surface 154 is at The horizontal displacement distance on the optical axis from the point of intersection on the optical axis to the maximum effective radius position of the fifth lens image side 154 is InRS52, and the thickness of the fifth lens 150 on the optical axis is TP5, which satisfies the following conditions: InRS51=-0.34789mm ; InRS52 = -0.88185mm; |InRS51|/TP5 = 0.32458 and |InRS52|/TP5 = 0.82276. Thereby, it is beneficial to the production and molding of the lens, and effectively maintains its miniaturization.

In the optical imaging system of this embodiment, the vertical distance between the critical point of the fifth lens object side 152 and the optical axis is HVT51, and the vertical distance between the critical point of the fifth lens image side 154 and the optical axis is HVT52, which satisfy the following conditions: HVT51 = 0.515349 mm; HVT52 = 0 mm.

In the optical imaging system of this embodiment, the horizontal displacement distance from the intersection point of the sixth lens object side surface 162 on the optical axis to the maximum effective radius position of the sixth lens object side surface 162 on the optical axis is InRS61, and the sixth lens image side surface 164 is at The horizontal displacement distance on the optical axis from the point of intersection on the optical axis to the maximum effective radius position of the sixth lens image side 164 is InRS62, and the thickness of the sixth lens 160 on the optical axis is TP6, which satisfies the following conditions: InRS61=-0.58390mm ; InRS62 = 0.41976 mm; |InRS61|/TP6 = 0.56616 and |InRS62|/TP6 = 0.40700. Thereby, it is beneficial to the production and molding of the lens, and effectively maintains its miniaturization.

In the optical imaging system of the present embodiment, the vertical distance between the critical point of the sixth lens object side 162 and the optical axis is HVT61, and the vertical distance between the critical point of the sixth lens image side 164 and the optical axis is HVT62, which satisfy the following conditions: HVT61 = 0 mm; HVT62 = 0 mm.

In the optical imaging system of this embodiment, it satisfies the following condition: HVT51/HOI=0.1031. Thereby, it is helpful for aberration correction of the peripheral field of view of the optical imaging system.

In the optical imaging system of this embodiment, it satisfies the following condition: HVT51/HOS=0.02634. Thereby, it is helpful for aberration correction of the peripheral field of view of the optical imaging system.

In the optical imaging system of this embodiment, the second lens, the third lens and the sixth lens have negative refractive power, the dispersion coefficient of the second lens is NA2, the dispersion coefficient of the third lens is NA3, and the dispersion coefficient of the sixth lens is NA6, which satisfies the following condition: NA6/NA2≦1. Thereby, it is helpful to correct the chromatic aberration of the optical imaging system.

In the optical imaging system of this embodiment, the TV distortion of the optical imaging system during imaging is TDT, and the optical distortion during imaging is ODT, which satisfy the following conditions: TDT=2.124%; ODT=5.076%.

In the optical imaging system of this embodiment, the longest working wavelength of visible light of the light fan diagram on the positive meridian plane passes through the edge of the aperture and is incident on the imaging plane. The shortest operating wavelength of visible light in the light fan diagram is incident on the imaging plane through the edge of the aperture. The lateral aberration of the 0.7 field of view on the imaging surface is represented by NLTA, which is 0.004mm, and the lateral aberration of the 0.7 field of view on the imaging surface is represented by NSTA when the shortest operating wavelength of visible light in the negative meridian plane light fan diagram is incident on the imaging surface through the edge of the aperture. It is -0.007mm. The longest working wavelength of visible light in the sagittal plane light fan diagram is incident on the imaging plane by the edge of the aperture. The lateral aberration of the field of view of 0.7 is represented by SLTA, which is -0.003mm. The shortest working wavelength of visible light in the sagittal plane light fan diagram is incident on the edge of the aperture. The lateral aberration of 0.7 field of view on the imaging surface is expressed as SSTA, which is 0.008 mm.

Then refer to Table 1 and Table 2 below.

Table 2. Aspheric coefficients of the first embodiment

According to Table 1 and Table 2, the following values related to the length of the contour curve can be obtained:

Table 1 shows the detailed structural data of the first embodiment in FIG. 1 , where the units of the radius of curvature, thickness, distance and focal length are mm, and surfaces 0-16 represent surfaces from the object side to the image side in turn. Table 2 shows the aspheric surface data in the first embodiment, wherein k represents the cone coefficient in the aspheric curve equation, and A1-A20 represent the 1st-20th order aspheric coefficients of each surface. In addition, the tables of the following embodiments are schematic diagrams and aberration curve diagrams corresponding to the respective embodiments, and the definitions of the data in the tables are the same as those in Table 1 and Table 2 of the first embodiment, and will not be repeated here.

second embodiment

Please refer to FIG. 2A and FIG. 2B, wherein FIG. 2A shows a schematic diagram of an optical imaging system according to the second embodiment of the present invention, and FIG. 2B shows the spherical aberration of the optical imaging system of the second embodiment from left to right, Curves of astigmatism and optical distortion. FIG. 2C is a lateral aberration diagram of the optical imaging system of the second embodiment at a field of view of 0.7. It can be seen from FIG. 2A that the optical imaging system includes an aperture 200, a first lens 210, a second lens 220, a third lens 230, a fourth lens 240, a fifth lens 250, a sixth lens 260, an infrared Filter 280 , imaging surface 290 and image sensor 292 .

The first lens 210 has a positive refractive power and is made of plastic material. Its object side 212 is convex, its image side 214 is concave, and both are aspherical. The object side 212 has an inflection point and the image side 214 has two reflection curved point.

The second lens 220 has positive refractive power and is made of plastic material. The object side 222 is concave, and the image side 224 is convex, both of which are aspherical. The object side 222 has an inflection point.

The third lens 230 has negative refractive power and is made of plastic material. The object side 232 is convex, and the image side 234 is concave, both of which are aspherical. Both the object side 232 and the image side 234 have an inflection point.

The fourth lens 240 has positive refractive power and is made of plastic material. The object side 242 is convex, and the image side 244 is concave, both of which are aspherical. Both the object side 242 and the image side 244 have two inflection points.

The fifth lens 250 has positive refractive power and is made of plastic material. The object side 252 is concave, and the image side 254 is convex, both of which are aspherical. Both the object side 252 and the image side 254 have an inflection point.

The sixth lens 260 has a negative refractive power and is made of plastic. The object side 262 is convex, and the image side 264 is concave. Thereby, it is beneficial to shorten the back focal length to maintain miniaturization. In addition, both the object side 262 and the image side 264 of the sixth lens have an inflection point, which can effectively suppress the incident angle of light in the off-axis field of view, and further correct the aberration of the off-axis field of view.

The infrared filter 280 is made of glass, which is disposed between the sixth lens 260 and the imaging surface 290 and does not affect the focal length of the optical imaging system.

Please refer to Table 3 and Table 4 below.

Table 4. Aspheric coefficients of the second embodiment

In the second embodiment, the curve equation of the aspheric surface is expressed in the form of the first embodiment. In addition, the definitions of the parameters in the table below are the same as those in the first embodiment, and will not be repeated here.

According to Table 3 and Table 4, the following conditional values can be obtained:

According to Table 3 and Table 4, the values related to the length of the contour curve can be obtained:

According to Table 3 and Table 4, the following values can be obtained:

third embodiment

Please refer to FIG. 3A and FIG. 3B, wherein FIG. 3A shows a schematic diagram of an optical imaging system according to the third embodiment of the present invention, and FIG. 3B shows the spherical aberration of the optical imaging system of the third embodiment from left to right, Curves of astigmatism and optical distortion. FIG. 3C is a lateral aberration diagram of the optical imaging system of the third embodiment at a field of view of 0.7. It can be seen from FIG. 3A that the optical imaging system includes an aperture 300, a first lens 310, a second lens 320, a third lens 330, a fourth lens 340, a fifth lens 350, a sixth lens 360, an infrared Filter 380 , imaging surface 390 and image sensor 392 .

The first lens 310 has positive refractive power and is made of plastic material. The object side 312 is convex, and the image side 314 is concave, both of which are aspherical. Both the object side 312 and the image side 314 have an inflection point.

The second lens 320 has a negative refractive power and is made of plastic material. Its object side 322 is convex, its image side 324 is concave, and both are aspherical. Its object side 322 has two inflection points and the image side 324 has three reflections curved point

The third lens 330 has negative refractive power and is made of plastic material. Its object side 332 is concave, and its image side 334 is concave, and both are aspherical. curved point.

The fourth lens 340 has positive refractive power and is made of plastic material. The object side 342 is convex, and the image side 344 is concave, both of which are aspherical. Both the object side 342 and the image side 344 have an inflection point.

The fifth lens 350 has positive refractive power and is made of plastic material. The object side 352 is concave, and the image side 354 is convex, both of which are aspherical. Both the object side 352 and the image side 354 have two inflection points.

The sixth lens 360 has a negative refractive power and is made of plastic. The object side 362 is convex, and the image side 364 is concave. Thereby, it is beneficial to shorten the back focal length to maintain miniaturization. In addition, both the object side 362 and the image side 364 have three inflection points, which can effectively suppress the incident angle of light in the off-axis field of view, and further correct the aberration of the off-axis field of view.

The infrared filter 380 is made of glass, which is disposed between the sixth lens 360 and the imaging surface 390 and does not affect the focal length of the optical imaging system.

Please refer to Table 5 and Table 6 below.

Table six, aspherical coefficients of the third embodiment

In the third embodiment, the curve equation of the aspheric surface is expressed in the form of the first embodiment. In addition, the definitions of the parameters in the table below are the same as those in the first embodiment, and will not be repeated here.

According to Table 5 and Table 6, the following conditional values can be obtained:

According to Table 5 and Table 6, the following values related to the length of the contour curve can be obtained:

According to Table 5 and Table 6, the following conditional values can be obtained:

Fourth embodiment

Please refer to FIG. 4A and FIG. 4, wherein FIG. 4A shows a schematic diagram of an optical imaging system according to the fourth embodiment of the present invention, and FIG. 4B shows the spherical aberration of the optical imaging system of the fourth embodiment from left to right, Curves of astigmatism and optical distortion. FIG. 4C is a lateral aberration diagram of the optical imaging system of the fourth embodiment at a field of view of 0.7. It can be seen from FIG. 4A that the optical imaging system includes, from the object side to the image side, an aperture 400, a first lens 410, a second lens 420, a third lens 430, a fourth lens 440, a fifth lens 450, a sixth lens 460, an infrared ray Filter 480 , imaging surface 490 and image sensor 492 .

The first lens 410 has positive refractive power and is made of plastic material. The object side 412 is convex, and the image side 414 is concave, both of which are aspherical. Both the object side 412 and the image side 414 have an inflection point.

The second lens 420 has negative refractive power and is made of plastic material. The object side 422 is convex, and the image side 424 is concave, both of which are aspherical. Both the object side 422 and the image side 424 have an inflection point.

The third lens 430 has a negative refractive power and is made of plastic material. Its object side 432 is concave, its image side 434 is concave, and both are aspherical. The object side 432 has three inflection points and the image side 434 has two Inflection point.

The fourth lens 440 has positive refractive power and is made of plastic material. The object side 442 is convex, and the image side 444 is concave, both of which are aspherical. Both the object side 442 and the image side 444 have two inflection points.

The fifth lens 450 has positive refractive power and is made of plastic material. The object side 452 is concave, and the image side 454 is convex, both of which are aspherical. Both the object side 452 and the image side 454 have an inflection point.

The sixth lens 460 has a negative refractive power and is made of plastic. The object side 462 is convex, and the image side 464 is concave. Thereby, it is beneficial to shorten the back focal length to maintain miniaturization. In addition, both the object side 462 and the image side 464 have an inflection point, which can effectively suppress the incident angle of light in the off-axis field of view, and further correct the aberration of the off-axis field of view.

The infrared filter 480 is made of glass, which is disposed between the sixth lens 460 and the imaging surface 490 and does not affect the focal length of the optical imaging system.

Please refer to Table 7 and Table 8 below.

Table 8. Aspheric coefficients of the fourth embodiment

In the fourth embodiment, the curve equation of the aspheric surface is expressed in the form of the first embodiment. In addition, the definitions of the parameters in the table below are the same as those in the first embodiment, and will not be repeated here.

According to Table 7 and Table 8, the following conditional values can be obtained:

According to Table 7 and Table 8, the following values related to the length of the contour curve can be obtained:

According to Table 7 and Table 8, the following conditional values can be obtained:

fifth embodiment

Please refer to FIG. 5A and FIG. 5B, wherein FIG. 5A shows a schematic diagram of an optical imaging system according to a fifth embodiment of the present invention, and FIG. 5B shows the spherical aberration of the optical imaging system of the fifth embodiment from left to right, Curves of astigmatism and optical distortion. FIG. 5C is a lateral aberration diagram of the optical imaging system of the fifth embodiment at a field of view of 0.7. It can be seen from FIG. 5A that the optical imaging system includes an aperture 500, a first lens 510, a second lens 520, a third lens 530, a fourth lens 540, a fifth lens 550, a sixth lens 560, and an infrared lens from the object side to the image side. Filter 580 , imaging surface 590 and image sensor 592 .

The first lens 510 has positive refractive power and is made of plastic material. The object side 512 is convex, and the image side 514 is concave, both of which are aspherical. Both the object side 522 and the image side 514 have an inflection point.

The second lens 520 has positive refractive power and is made of plastic material. The object side 522 is concave, and the image side 524 is convex, both of which are aspherical. The object side 522 has two inflection points.

The third lens 530 has a negative refractive power and is made of plastic material. Its object side 532 is convex, its image side 534 is concave, and both are aspherical. The object side 532 has two inflection points and the image side 534 has one. Inflection point.

The fourth lens 540 has negative refractive power and is made of plastic material. Its object side 542 is convex, and its image side 544 is convex, both of which are aspherical. The object side 542 has three inflection points and the image side 544 has two points of inflection. Inflection point.

The fifth lens 550 has positive refractive power and is made of plastic material. The object side 552 is concave, and the image side 554 is convex, both of which are aspherical. The image side 554 has an inflection point.

The sixth lens 560 has a negative refractive power and is made of plastic. The object side 562 is convex, and the image side 564 is concave. Thereby, it is beneficial to shorten the back focal length to maintain miniaturization. In addition, the object side 562 has two inflection points and the image side 564 has one inflection point, which can effectively suppress the incident angle of the off-axis field of view light and correct the aberration of the off-axis field of view.

The infrared filter 580 is made of glass, which is disposed between the sixth lens 560 and the imaging surface 590 and does not affect the focal length of the optical imaging system.

Please refer to Table 9 and Table 10 below.

Table ten, the aspheric coefficient of the fifth embodiment

In the fifth embodiment, the curve equation of the aspheric surface is expressed in the form of the first embodiment. In addition, the definitions of the parameters in the table below are the same as those in the first embodiment, and will not be repeated here.

According to Table 9 and Table 10, the following conditional values can be obtained:

According to Table 9 and Table 10, the following values related to the length of the contour curve can be obtained:

According to Table 9 and Table 10, the following conditional values can be obtained:

Sixth embodiment

Please refer to FIG. 6A and FIG. 6B, wherein FIG. 6A shows a schematic diagram of an optical imaging system according to the sixth embodiment of the present invention, and FIG. 6B shows the spherical aberration of the optical imaging system of the sixth embodiment from left to right, Curves of astigmatism and optical distortion. FIG. 6C is a lateral aberration diagram of the optical imaging system of the sixth embodiment at a field of view of 0.7. It can be seen from FIG. 6A that the optical imaging system includes an aperture 600, a first lens 610, a second lens 620, a third lens 630, a fourth lens 640, a fifth lens 650, a sixth lens 660, and an infrared ray from the object side to the image side. Filter 680 , imaging surface 690 and image sensor 692 .

The first lens 610 has a positive refractive power and is made of plastic material. The object side 612 is convex, and the image side 614 is concave, both of which are aspherical. The object side 612 has an inflection point and the image side 614 has two Inflection point.

The second lens 620 has positive refractive power and is made of plastic material. The object side 622 is concave, and the image side 624 is convex, both of which are aspherical. The object side 622 has an inflection point.

The third lens 630 has negative refractive power and is made of plastic material. The object side 632 is convex, and the image side 634 is concave, both of which are aspherical. Both the object side 632 and the image side 634 have an inflection point.

The fourth lens 640 has negative refractive power and is made of plastic material. Its object side 642 is convex, its image side 644 is concave, and both are aspherical. curved point.

The fifth lens 650 has positive refractive power and is made of plastic material. The object side 652 is concave, and the image side 654 is convex, both of which are aspherical. Both the object side 652 and the image side 654 have an inflection point.

The sixth lens 660 has negative refractive power and is made of plastic material. The object side 662 is convex, and the image side 664 is concave. Both the object side 662 and the image side 664 have an inflection point. Thereby, it is beneficial to shorten the back focal length to maintain miniaturization, and can effectively suppress the incident angle of the off-axis field of view light, and further correct the aberration of the off-axis field of view.

The infrared filter 680 is made of glass, which is disposed between the sixth lens 660 and the imaging surface 690 and does not affect the focal length of the optical imaging system.

Please refer to Table 11 and Table 12 below.

Table 12. Aspheric coefficients of the sixth embodiment

In the sixth embodiment, the curve equation of the aspheric surface is expressed in the form of the first embodiment. In addition, the definitions of the parameters in the table below are the same as those in the first embodiment, and will not be repeated here.

According to Table 11 and Table 12, the following conditional values can be obtained:

According to Table 11 and Table 12, the values related to the length of the contour curve can be obtained:

According to Table 11 and Table 12, the following conditional values can be obtained:

Seventh embodiment

Please refer to FIG. 7A and FIG. 7B, wherein FIG. 7A shows a schematic diagram of an optical imaging system according to the seventh embodiment of the present invention, and FIG. 7B shows the spherical aberration of the optical imaging system of the seventh embodiment from left to right, Curves of astigmatism and optical distortion. FIG. 7C is a lateral aberration diagram of the optical imaging system of the seventh embodiment at a field of view of 0.7. It can be seen from FIG. 7A that the optical imaging system includes an aperture 700, a first lens 710, a second lens 720, a third lens 730, a fourth lens 740, a fifth lens 750, a sixth lens 760, and an infrared lens from the object side to the image side. Filter 780 , imaging surface 790 and image sensor 792 .

The first lens 710 has positive refractive power and is made of plastic material. The object side 712 is convex, and the image side 714 is concave, both of which are aspherical. Both the object side 712 and the image side 714 have an inflection point.

The second lens 720 has negative refractive power and is made of plastic material. The object side 722 is convex, and the image side 724 is concave, both of which are aspherical. The object side 722 has two inflection points.

The third lens 730 has negative refractive power and is made of plastic material. The object side 732 is concave, and the image side 734 is convex, both of which are aspherical. Both the object side 732 and the image side 734 have three inflection points.

The fourth lens 740 has positive refractive power and is made of plastic material. The object side 742 is convex, and the image side 744 is concave, both of which are aspherical. Both the object side 742 and the image side 744 have an inflection point.

The fifth lens 750 has positive refractive power and is made of plastic material. Its object side 752 is concave, its image side 754 is convex, and both are aspherical. The object side 752 has three inflection points and the image side 754 has a Inflection point.

The sixth lens 770 has negative refractive power and is made of plastic material. The object side 762 is convex, and the image side 764 is concave. The object side 762 has three inflection points and the image side 764 has one inflection point. Thereby, it is beneficial to shorten the back focal length to maintain miniaturization. In addition, the incident angle of the off-axis field of view light can also be effectively suppressed, and the aberration of the off-axis field of view can be further corrected.

The infrared filter 780 is made of glass, which is disposed between the sixth lens 760 and the imaging surface 790 and does not affect the focal length of the optical imaging system.

Please refer to Table 13 and Table 14 below.

Table 14. Aspheric coefficients of the seventh embodiment

In the seventh embodiment, the curve equation of the aspheric surface is expressed in the form of the first embodiment. In addition, the definitions of the parameters in the table below are the same as those in the first embodiment, and will not be repeated here.

According to Table 13 and Table 14, the following conditional values can be obtained:

According to Table 13 and Table 14, the values related to the length of the contour curve can be obtained:

According to Table 13 and Table 14, the following conditional values can be obtained:

Eighth embodiment

Please refer to FIG. 8A and FIG. 8B, wherein FIG. 8A shows a schematic diagram of an optical imaging system according to the eighth embodiment of the present invention, and FIG. 8B shows the spherical aberration of the optical imaging system of the eighth embodiment from left to right, Curves of astigmatism and optical distortion. FIG. 8C is a lateral aberration diagram of the optical imaging system of the eighth embodiment at a field of view of 0.7. It can be seen from FIG. 8A that the optical imaging system includes an aperture 800, a first lens 810, a second lens 820, a third lens 830, a fourth lens 840, a fifth lens 850, a sixth lens 860, and an infrared ray from the object side to the image side. Filter 880 , imaging surface 890 and image sensor 892 .

The first lens 810 has positive refractive power and is made of plastic material. The object side 812 is convex, and the image side 814 is concave, both of which are aspherical. Both the object side 812 and the image side 814 have an inflection point.

The second lens 820 has positive refractive power and is made of plastic material. The object side 822 is convex, and the image side 824 is concave, both of which are aspherical. Both the object side 822 and the image side 824 have two inflection points.

The third lens 830 has a negative refractive power and is made of plastic material. Its object side 832 is concave, and its image side 834 is concave, both of which are aspherical. The object side 832 has three inflection points and the image side 834 has a Inflection point.

The fourth lens 840 has negative refractive power and is made of plastic material. The object side 842 is convex, and the image side 844 is concave, both of which are aspherical. Both the object side 842 and the image side 844 have two inflection points.

The fifth lens 850 has positive refractive power and is made of plastic material. The object side 852 is concave, and the image side 854 is convex, both of which are aspherical. Both the object side 852 and the image side 854 have two inflection points.

The sixth lens 880 has negative refractive power and is made of plastic material. The object side 862 is convex, and the image side 864 is concave. The object side 862 has two inflection points and the image side 864 has one inflection point. Thereby, it is beneficial to shorten the back focal length to maintain miniaturization, and can effectively suppress the incident angle of the off-axis field of view light, and further correct the aberration of the off-axis field of view.

The infrared filter 880 is made of glass, which is disposed between the sixth lens 860 and the imaging surface 890 and does not affect the focal length of the optical imaging system.

Please refer to Table 15 and Table 16 below.

Table sixteen, the aspheric coefficient of the eighth embodiment

In the eighth embodiment, the curve equation of the aspheric surface is expressed in the form of the first embodiment. In addition, the definitions of the parameters in the table below are the same as those in the first embodiment, and will not be repeated here.

According to Table 15 and Table 16, the following conditional values can be obtained:

According to Table 15 and Table 16, the values related to the length of the contour curve can be obtained:

According to Table 15 and Table 16, the following conditional values can be obtained:

Ninth embodiment

Please refer to FIG. 9A and FIG. 9B, wherein FIG. 9A shows a schematic diagram of an optical imaging system according to the ninth embodiment of the present invention, and FIG. 9B shows the spherical aberration of the optical imaging system of the ninth embodiment from left to right, Curves of astigmatism and optical distortion. FIG. 9C is a lateral aberration diagram of the optical imaging system of the ninth embodiment at a field of view of 0.7. It can be seen from FIG. 9A that the optical imaging system includes an aperture 900, a first lens 910, a second lens 920, a third lens 930, a fourth lens 940, a fifth lens 950, a sixth lens 960, and an infrared lens from the object side to the image side. Filter 980 , imaging surface 990 and image sensor 992 .

The first lens 910 has positive refractive power and is made of plastic material. The object side 912 is convex, and the image side 914 is concave, both of which are aspherical. Both the object side 912 and the image side 914 have an inflection point.

The second lens 920 has negative refractive power and is made of plastic material. The object side 922 is convex, and the image side 924 is concave, both of which are aspherical. The object side 922 has two inflection points.

The third lens 930 has negative refractive power and is made of plastic material. The object side 932 is concave, and the image side 934 is convex, both of which are aspherical. Both the object side 932 and the image side 934 have three inflection points.

The fourth lens 940 has positive refractive power and is made of plastic material. The object side 942 is convex, and the image side 944 is concave, both of which are aspherical. Both the object side 942 and the image side 944 have an inflection point.

The fifth lens 950 has positive refractive power and is made of plastic material. Its object side 952 is concave, its image side 954 is convex, and both are aspheric. Its object side 952 has three inflection points and image side 954 has an curved point.

The sixth lens 960 has negative refractive power and is made of plastic material. The object side 962 is convex, and the image side 964 is concave. The object side 962 has three inflection points and the image side 964 has one inflection point. Thereby, it is beneficial to shorten the back focal length to maintain miniaturization, and can effectively suppress the incident angle of the off-axis field of view light, and further correct the aberration of the off-axis field of view.

The infrared filter 980 is made of glass, which is disposed between the sixth lens 960 and the imaging surface 990 and does not affect the focal length of the optical imaging system.

Please refer to Table 17 and Table 18 below.

Table 18. Aspheric coefficients of the ninth embodiment

In the ninth embodiment, the curve equation of the aspheric surface is expressed in the form of the first embodiment. In addition, the definitions of the parameters in the table below are the same as those in the first embodiment, and will not be repeated here.

According to Table 17 and Table 18, the following conditional values can be obtained:

According to Table 17 and Table 18, the values related to the length of the contour curve can be obtained:

According to Table 17 and Table 18, the following conditional values can be obtained:

Although the present invention has been disclosed above in terms of implementation, it is not intended to limit the present invention. Any person skilled in the art may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection shall prevail as defined by the appended claims.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that the spirit and scope of the invention as defined by the scope of the following claims and their equivalents shall be understood by those skilled in the art. Various changes in form and detail may be made therein.

Claims (25)

1. a kind of optical imaging system, it is characterised in that included successively by thing side to image side：

One first lens, with refracting power；

One second lens, with refracting power；

One the 3rd lens, with refracting power；

One the 4th lens, with refracting power；

One the 5th lens, with refracting power；

One the 6th lens, with refracting power；And

One imaging surface, wherein there are the optical imaging system lens of refracting power to be six pieces, the optical imaging system is in institute Stating on imaging surface perpendicular to optical axis has a maximum image height HOI, and first lens into the 6th lens at least Two pieces of its respective at least surfaces of lens have an at least point of inflexion, and first lens are into the 6th lens at least one Piece lens have positive refracting power, and the focal length of first lens to the 6th lens is respectively f1, f2, f3, f4, f5, f6, institute The focal length for stating optical imaging system is f, and the entrance pupil diameter of the optical imaging system is HEP, the first lens thing side Face to the imaging surface in having on optical axis one apart from HOS, the first lens thing side to the 6th lens image side surface in Have one on optical axis apart from InTL, the half of the maximum visual angle of the optical imaging system is HAF, the optical imagery system Unite in there is a maximum image height HOI perpendicular to optical axis on the imaging surface, with the either table of any lens in said lens The intersection point of face and optical axis be starting point, along the surface profile until on the surface apart from the entrance pupil diameter of optical axis 1/2 Vertical height at coordinate points untill, the contour curve length of foregoing point-to-point transmission is ARE, and it meets following condition：1.0≦f/ HEP≦2.2；0.5≦HOS/f≦5.0；0.5≤HOS/HOI≤1.6 and 0.9≤2 (ARE/HEP)≤1.5.

2. optical imaging system as claimed in claim 1, it is characterised in that the optical imaging system meets following relationship Formula：0.5≦HOS/HOI≦1.5.

3. optical imaging system as claimed in claim 1, it is characterised in that the maximum visual angle of the optical imaging system Half be HAF, it meets following equation：0deg<HAF≦60deg.

4. optical imaging system as claimed in claim 1, it is characterised in that the imaging surface is a plane or a curved surface.

5. optical imaging system as claimed in claim 1, it is characterised in that TV of optical imaging system when imaging is abnormal It is changed into TDT, the optical imaging system perpendicular to optical axis on the imaging surface in having a maximum image height HOI, the light Learn imaging system positive meridian plane light fan most long operation wavelength is by entrance pupil edge and is incident on the imaging surface Lateral aberration at 0.7HOI represents with PLTA, the most short operation wavelength of its positive meridian plane light fan by entrance pupil edge simultaneously It is incident on the lateral aberration on the imaging surface at 0.7HOI to represent with PSTA, the negative sense meridian plane light of the optical imaging system Fan most long operation wavelength is by entrance pupil edge and is incident on the lateral aberration on the imaging surface at 0.7HOI with NLTA Represent, the negative sense meridian plane light of optical imaging system fan most short operation wavelength is by entrance pupil edge and is incident on institute State the lateral aberration on imaging surface at 0.7HOI to represent with NSTA, the most long work of the sagittal surface light fan of the optical imaging system Wavelength represented by entrance pupil edge and the lateral aberration that is incident on the imaging surface at 0.7HOI with SLTA, the optics Imaging system sagittal surface light fan most short operation wavelength is by entrance pupil edge and is incident on 0.7HOI on the imaging surface The lateral aberration at place represents that it meets following condition with SSTA：PLTA≤50 micron；PSTA≤50 micron；NLTA≤50 micron； NSTA≤50 micron；SLTA≤50 micron；SSTA≤50 micron；And │ TDT │<100%.

6. optical imaging system as claimed in claim 1, it is characterised in that any surface of any lens in said lens Maximum effective radius represents that any surface of any lens and the intersection point of optical axis is starting points using in said lens, along institute with EHD The profile for stating surface is terminal at the maximum effective radius on the surface, and the contour curve length of foregoing point-to-point transmission is ARS, It meets following equation：0.9≦ARS/EHD≦2.0.

7. optical imaging system as claimed in claim 1, it is characterised in that with the thing side of the 6th lens on optical axis Intersection point be starting point, along the profile on the surface until the vertical height on the surface apart from the entrance pupil diameter of optical axis 1/2 Untill coordinate points at degree, the contour curve length of foregoing point-to-point transmission is ARE61, with the image side surface of the 6th lens in optical axis On intersection point be starting point, along the surface profile until on the surface apart from the vertical of the entrance pupil diameter of optical axis 1/2 Highly untill the coordinate points at place, the contour curve length of foregoing point-to-point transmission is ARE62, and the 6th lens are in the thickness on optical axis For TP6, it meets following condition：0.05≦ARE61/TP6≦15；And 0.05≤ARE62/TP6≤15.

8. optical imaging system as claimed in claim 1, it is characterised in that with the thing side of the 5th lens on optical axis Intersection point be starting point, along the profile on the surface until the vertical height on the surface apart from the entrance pupil diameter of optical axis 1/2 Untill coordinate points at degree, the contour curve length of foregoing point-to-point transmission is ARE51, with the image side surface of the 5th lens in optical axis On intersection point be starting point, along the surface profile until on the surface apart from the vertical of the entrance pupil diameter of optical axis 1/2 Highly untill the coordinate points at place, the contour curve length of foregoing point-to-point transmission is ARE52, and the 5th lens are in the thickness on optical axis For TP5, it meets following condition：0.05≦ARE51/TP5≦15；And 0.05≤ARE52/TP5≤15.

9. optical imaging system as claimed in claim 1, it is characterised in that also including an aperture, and the aperture is to institute Imaging surface is stated in having one on optical axis apart from InS, it meets following equation：0.2≦InS/HOS≦1.1.

10. a kind of optical imaging system, it is characterised in that included successively by thing side to image side：

One first lens, with refracting power；

One second lens, with refracting power；

One the 3rd lens, with refracting power；

One the 4th lens, with refracting power；

One the 5th lens, with refracting power；

One the 6th lens, with refracting power；And

One imaging surface, wherein there are the optical imaging system lens of refracting power to be six pieces, the optical imaging system is in institute Stating on imaging surface perpendicular to optical axis has a maximum image height HOI, and first lens into the 6th lens at least An at least surface for one piece of lens has at least two points of inflexion, first lens at least one piece lens into the 3rd lens With positive refracting power, the 4th lens at least one piece lens into the 6th lens have positive refracting power, and described first is saturating The focal length of mirror to the 6th lens is respectively f1, f2, f3, f4, f5, f6, and the focal length of the optical imaging system is f, described The entrance pupil diameter of optical imaging system is HEP, and the first lens thing side to the imaging surface is in having one on optical axis Apart from HOS, the first lens thing side to the 6th lens image side surface is in having one apart from InTL on optical axis, the optics The half of the maximum visual angle of imaging system be HAF, the optical imaging system on the imaging surface perpendicular to optical axis have There is a maximum image height HOI, any surface of any lens and the intersection point of optical axis is starting points using in said lens, along described The profile on surface is foregoing untill the coordinate points on the surface at the vertical height of the entrance pupil diameter of optical axis 1/2 The contour curve length of point-to-point transmission is ARE, and it meets following condition：1.0≦f/HEP≦2.2；0.5≦HOS/f≦3.0；0.5 ≤ HOS/HOI≤1.6 and 0.9≤2 (ARE/HEP)≤1.5.

11. optical imaging system as claimed in claim 10, it is characterised in that the optical imaging system meets following relationship Formula：0.5≦HOS/HOI≦1.5.

12. optical imaging system as claimed in claim 10, it is characterised in that first lens are into the 3rd lens An at least surface at least one piece lens has an at least critical point.

13. optical imaging system as claimed in claim 10, it is characterised in that any surface of any lens in said lens Maximum effective radius represented with EHD, using in said lens any surface of any lens and the intersection point of optical axis as starting point, along The profile on the surface is terminal at the maximum effective radius on the surface, and the contour curve length of foregoing point-to-point transmission is ARS, it meets following equation：0.9≦ARS/EHD≦2.0.

14. optical imaging system as claimed in claim 10, it is characterised in that the optical imaging system is in the imaging surface On there is a maximum image height HOI, the most long work of the positive meridian plane light fan of the optical imaging system perpendicular to optical axis Wavelength represented by entrance pupil edge and the lateral aberration that is incident on the imaging surface at 0.7HOI with PLTA, its positive son Noon face light fan most short operation wavelength is by entrance pupil edge and is incident on the lateral aberration on the imaging surface at 0.7HOI Represented with PSTA, the most long operation wavelength of the negative sense meridian plane light fan of the optical imaging system is incorporated to by entrance pupil edge Penetrate the lateral aberration on the imaging surface at 0.7HOI to represent with NLTA, the negative sense meridian plane light fan of the optical imaging system Most short operation wavelength is by entrance pupil edge and is incident on the lateral aberration on the imaging surface at 0.7HOI with NSTA tables Show, the sagittal surface light of optical imaging system fan most long operation wavelength is by entrance pupil edge and is incident on the imaging Lateral aberration on face at 0.7HOI represents that the most short operation wavelength of the sagittal surface light fan of the optical imaging system is led to SLTA The lateral aberration crossed entrance pupil edge and be incident on the imaging surface at 0.7HOI represents that it meets following bar with SSTA Part：PLTA≤50 micron；PSTA≤50 micron；NLTA≤50 micron；NSTA≤50 micron；SLTA≤50 micron；And SSTA ≤ 50 microns.

15. optical imaging system as claimed in claim 10, it is characterised in that first lens and second lens it Between in the distance on optical axis be IN12, and meet following equation：0<IN12/f≦5.0.

16. optical imaging system as claimed in claim 10, it is characterised in that the 5th lens and the 6th lens it Between in the distance on optical axis be IN56, and meet following equation：0<IN56/f≦5.0.

17. optical imaging system as claimed in claim 10, it is characterised in that the 5th lens and the 6th lens it Between in the distance on optical axis be IN56, the 5th lens and the 6th lens in the thickness on optical axis be respectively TP5 and TP6, it meets following condition：0.1≦(TP6+IN56)/TP5≦50.

18. optical imaging system as claimed in claim 10, it is characterised in that first lens and second lens it Between in the distance on optical axis be IN12, first lens and second lens in the thickness on optical axis be respectively TP1 and TP2, it meets following condition：0.1≦(TP1+IN12)/TP2≦50.

19. optical imaging system as claimed in claim 10, it is characterised in that first lens, second lens, institute At least one piece lens in the 3rd lens, the 4th lens, the 5th lens and the 6th lens are stated for wavelength to be less than 500nm light filters out component.

20. a kind of optical imaging system, it is characterised in that included successively by thing side to image side：

One first lens, with refracting power；

One second lens, with refracting power；

One the 3rd lens, with refracting power；

One the 4th lens, with refracting power；

One the 5th lens, with refracting power；

One the 6th lens, with refracting power；And

One imaging surface, wherein there are the optical imaging system lens of refracting power to be six pieces, the optical imaging system is in institute State on imaging surface perpendicular to optical axis with a maximum image height HOI, first lens are into the 3rd lens at least one Piece lens have positive refracting power, and the 4th lens at least one piece lens into the 6th lens have positive refracting power, and institute Stating the first lens at least three pieces its respective at least surface of lens into the 6th lens has an at least point of inflexion, described The focal length of first lens to the 6th lens is respectively f1, f2, f3, f4, f5, f6, and the focal length of the optical imaging system is F, the entrance pupil diameter of the optical imaging system is HEP, and the first lens thing side is to the imaging surface on optical axis With one apart from HOS, the first lens thing side to the 6th lens image side surface is in having one apart from InTL, institute on optical axis The half for stating the maximum visual angle of optical imaging system is HAF, with any surface and optical axis of any lens in said lens Intersection point be starting point, along the profile on the surface until the vertical height on the surface apart from the entrance pupil diameter of optical axis 1/2 Untill coordinate points at degree, the contour curve length of foregoing point-to-point transmission is ARE, and it meets following condition：1.0≦f/HEP≦ 2.2；0.5≦HOS/f≦1.6；0.5≤HOS/HOI≤1.6 and 0.9≤2 (ARE/HEP)≤1.5.

21. optical imaging system as claimed in claim 20, it is characterised in that the either table of any lens in more above-mentioned lens The maximum effective radius in face represents that any surface of any lens and the intersection point of optical axis is starting points using in said lens, edge with EHD The profile for the surface is terminal at the maximum effective radius on the surface, and the contour curve length of foregoing point-to-point transmission is ARS, it meets following equation：0.9≦ARS/EHD≦2.0.

22. optical imaging system as claimed in claim 20, it is characterised in that the optical imaging system meets following public affairs Formula：0mm<HOS≦30mm.

23. optical imaging system as claimed in claim 20, it is characterised in that with the thing side of the 6th lens in optical axis On intersection point be starting point, along the surface profile until on the surface apart from the vertical of the entrance pupil diameter of optical axis 1/2 Highly untill the coordinate points at place, the contour curve length of foregoing point-to-point transmission is ARE61, with the image side surface of the 6th lens in light Intersection point on axle is starting point, along the profile on the surface until hanging down apart from the entrance pupil diameter of optical axis 1/2 on the surface Untill coordinate points at straight height, the contour curve length of foregoing point-to-point transmission is ARE62, and the 6th lens are in the thickness on optical axis Spend for TP6, it meets following condition：0.05≦ARE61/TP6≦15；And 0.05≤ARE62/TP6≤15.

24. optical imaging system as claimed in claim 20, it is characterised in that with the thing side of the 5th lens in optical axis On intersection point be starting point, along the surface profile until on the surface apart from the vertical of the entrance pupil diameter of optical axis 1/2 Highly place coordinate points untill, the contour curve length of foregoing point-to-point transmission is ARE51, with the image side surface of the 5th lens in Intersection point on optical axis is starting point, along the surface profile until on the surface apart from the entrance pupil diameter of optical axis 1/2 Untill coordinate points at vertical height, the contour curve length of foregoing point-to-point transmission is ARE52, and the 5th lens are on optical axis Thickness is TP5, and it meets following condition：0.05≦ARE51/TP5≦15；And 0.05≤ARE52/TP5≤15.

25. optical imaging system as claimed in claim 20, it is characterised in that the optical imaging system also includes a light Circle, an imaging sensor and a drive module, described image sensor are arranged at the imaging surface, and the aperture is to institute Imaging surface is stated in having one on optical axis apart from InS, the drive module is coupled with each lens and produces each lens Raw displacement, it meets following equation：0.2≦InS/HOS≦1.1.